不同立地铁杆蒿化学计量特征及其与土壤养分的关系
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摘要
以陕西吴起杨青川流域铁杆蒿群落为研究对象,结合坡向、坡位及土壤养分变化探究不同立地铁杆蒿群落化学计量特征及其与土壤养分的关系.结果表明:从峁顶、阳坡、半阴坡到阴坡,铁杆蒿地上部分和根有机碳、全氮、全磷含量、碳氮比均逐渐增大;地上部分碳磷比和根氮磷比呈减小趋势;地上部分氮磷比、根碳磷比先减小后增大.从峁顶、上坡位、中坡位到下坡位,地上部分有机碳、全氮、全磷含量以及根有机碳含量先增加后减小;地上部分碳氮比、氮磷比先减小后增大.铁杆蒿群落植物化学计量特征一般与土壤化学计量特征呈正相关,但碳氮比、碳磷比、氮磷比及根全磷与土壤相应指标呈负相关,且植物地上部分与土壤的相关性大于根.综上,不同立地铁杆蒿群落植物在阴坡中坡位生长状态最佳,其化学计量特征与土壤养分状况具有明显的相关关系.坡向和坡位在铁杆蒿群落植物和土壤的化学计量特征中具有重要影响,适宜的铁杆蒿群落将有利于土壤养分的恢复.
We explored the stoichiometric characteristic of Artemisia sacrorum communities and its correlation with soil characters by considering the aspect and slope position, and variation of soil nutrient in Yangqingchuan catchment of Wuqi. Our results showed that total carbon, total nitrogen, total phosphorus contents and C:N ratio in A. sacrorum(both shoot and root) in the top of hillock>sunny slope>semi-shady slope>shady slope. The C:P ratio in shoot and the N:P ratio in root decreased consistently. The N:P ratio in shoot and the C:P ratio in root decreased first and then increased. While the total nitrogen and total phosphorus in shoot, and the organic carbon in root increased first and then decreased with the decreases of slope position, the C:N ratio and N:P ratio in shoot decreased first and then increased. The stoichiometric characteristic of A. sacrorum communities was positively correlated with the soil stoichiometric characteristics. However, the C:N ratio, C:P ratio and N:P ratio of A. sacrorum and the total phosphorus of root were negatively correlated to corresponding soil indices. The correlation between shoot nutrition and soil was greater than that between soil and root nutrition. In conclusion, middle position of shady slope was optimal for the growth of A. sacrorum. The stoichiometric characteristics of plants were significantly correlated with soil nutrient condition. Aspect and slope position had a significant effect on the stoichiometric cha-racteristics of A. sacrorum community and soil. Proper A. sacrorum community could help restore soil nutrition.
We explored the stoichiometric characteristic of Artemisia sacrorum communities and its correlation with soil characters by considering the aspect and slope position, and variation of soil nutrient in Yangqingchuan catchment of Wuqi. Our results showed that total carbon, total nitrogen, total phosphorus contents and C:N ratio in A. sacrorum(both shoot and root) in the top of hillock>sunny slope>semi-shady slope>shady slope. The C:P ratio in shoot and the N:P ratio in root decreased consistently. The N:P ratio in shoot and the C:P ratio in root decreased first and then increased. While the total nitrogen and total phosphorus in shoot, and the organic carbon in root increased first and then decreased with the decreases of slope position, the C:N ratio and N:P ratio in shoot decreased first and then increased. The stoichiometric characteristic of A. sacrorum communities was positively correlated with the soil stoichiometric characteristics. However, the C:N ratio, C:P ratio and N:P ratio of A. sacrorum and the total phosphorus of root were negatively correlated to corresponding soil indices. The correlation between shoot nutrition and soil was greater than that between soil and root nutrition. In conclusion, middle position of shady slope was optimal for the growth of A. sacrorum. The stoichiometric characteristics of plants were significantly correlated with soil nutrient condition. Aspect and slope position had a significant effect on the stoichiometric cha-racteristics of A. sacrorum community and soil. Proper A. sacrorum community could help restore soil nutrition.
引文
[1] Wang G-L (王国梁),Liu G-B (刘国彬),Zhou S-L (周生路).The effect of vegetation restoration on soil stable infiltration rates in small watershed of loess gully region.Journal of Natural Resources (自然资源学报),2003,18(5):529-535 (in Chinese)
[2] Zhou P (周萍),Liu G-B (刘国彬),Hou X-L (侯喜禄).Study on vegetation and soil nutrient characters of Artemisia sacrorum communities in hilly-gully region of the Loess Plateau.Acta Prataculturae Sinica (草业学报),2008,17(2):9-18 (in Chinese)
[3] Zhang W-Y (张文彦),Fan J-W (樊江文),Zhong H-P (钟华平),et al.The nitrogen:phosphorus stoichio-metry of different plant functional groups for dominant species of typical steppes in China.Acta Agrestia Sinica (草地学报),2010,18(4):503-509 (in Chinese)
[4] Ren S-J (任书杰),Yu G-R (于贵瑞),Jiang C-M (姜春明),et al.Stoichiometric characteristics of leaf carbon,nitrogen,and phosphorus of 102 dominant species in forest ecosystems along the North-South Transect of East China.Chinese Journal of Applied Ecology (应用生态学报),2012,23(3):581-586 (in Chinese)
[5] Ren S-J (任书杰),Yu G-R (于贵瑞),Tao B (陶波),et al.Leaf nitrogen and phosphorus stoichiometry across 654 terrestrial plant species in NSTEC.Environmental Science (环境科学),2007,28(12):2665-2673 (in Chinese)
[6] Hara M,Hirata K,Fujihara M,et al.Vegetation structure in relation to micro-landform in an evergreen broad-leaved forest on Amami Ohshima Island,south-west Japan.Ecological Research,1996,11:325-337
[7] Yang Y-C (杨永川),Da L-J (达良俊).A brief review of studies on differentation of vegetation pattern along a topographic gradient in hilly regions.Chinese Journal of Plant Ecology (植物生态学报),2006,30(3):504-513 (in Chinese)
[8] Gong X,Brueck H,Giese KM,et al.Slope aspect has effects on productivity and species composition of hilly grassland in the Xilin River Basin,Inner Mongolia,China.Journal of Arid Environments,2008,72:483-493
[9] Wallace KJ,Laughlin DC,Clarkson BD.Exotic weeds and fluctuating microclimate can constrain native plant regeneration in urban forest restoration.Ecological Applications,2017,27:1268
[10] Liu M-X (刘旻霞).Plant Community Composition and Nitrogen-phosphorus Stoichiometry along a Slope Aspect Gradient in An Alpine Meadow.PhD Thesis.Lanzhou:Lanzhou University,2013 (in Chinese)
[11] Fravolini G,Egli M,Derungs C,et al.Soil attributes and microclimate are important drivers of initial deadwood decay in sub-alpine Norway spruce forests.Science of the Total Environment,2016,569-570:1064-1076
[12] Kraft NJ,Valencia R,Ackerly DD.Functional traits and niche-based tree community assembly in an Amazonian forest.Science,2008,322:580-582
[13] Lin L-W (林兰稳),Yu W-M (余炜敏),Xiao Z-Q (肖振奇),et al.The relation of the growth of Schizostachyum funghomii plantation to site condition.Ecology and Environmental Sciences (生态环境学报),2011,20(1):88-90 (in Chinese)
[14] Qi J (祁建),Ma K-M (马克明),Zhang Y-X (张育新).Comparisons on leaf traits of Quercus liaotungensis Koidz.on different slope positions in Dongling Moutain of Beijing.Acta Ecologica Sinica (生态学报),2008,28(1):122-128 (in Chinese)
[15] Zhang T (张婷),Chen Y-M (陈云明),Wu C-H (武春华).Change of underground biomass and soil fertility with restoration stages of Artemisia gmelinii and Stipa bungeana in loess hilly region.Science of Soil and Water Conservation (中国水土保持科学),2011,9(5):91-97 (in Chinese)
[16] Ma X-H (马祥华),Jiao J-Y (焦菊英).Characteristics of vegetation with natural restoration in removal lands in loess hilly-gully region and the relationship between the characteristics and soil environment.Science of Soil and Water Conservation (中国水土保持科学),2005,3(2):15-22 (in Chinese)
[17] Xu H-M (许红梅),Gao Q (高琼),Huang Y-M (黄永梅),et al.Photosynthetic characteristics of six plant species in a forest steppe of the Loess Plateau,China.Chinese Journal of Plant Ecology (植物生态学报),2004,28(2):157-163 (in Chinese)
[18] Wang G-L (王国梁),Liu G-B (刘国彬),Xu M-X (许明祥).Effect of vegetation restoration on soil nutrient changes in Zhifanggou Watershed of loess hilly region.Bulletin of Soil and Water Conservation (水土保持通报),2002,22(1):1-5 (in Chinese)
[19] Bai W-J (白文娟),Zheng F-L (郑粉莉),Dong L-L (董莉丽),et al.Leaf traits of species in different habits in the water-wind erosion region of the Loess Plateau.Acta Ecologica Sinica (生态学报),2010,30(10):2529-2540 (in Chinese)
[20] Tilman D,Reich PB,Knops J,et al.Diversity and productivity in a long-term grassland experiment.Science,2001,294:843-845
[21] Kou M (寇萌),Jiao J-Y (焦菊英),Du H-D (杜华栋),et al.The altitudinal variation of leaf traits of Quercus liaotungensis and associated environmental explanations.Journal of Northwest Forestry University (西北林学院学报),2013,28(1):12-18 (in Chinese)
[22] Zhang S-P (张顺平),Qiao J (乔杰),Sun X-Y (孙向阳),et al.Effects of slope aspect and slope position on spatial distribution of soil nutrients of Paulownia fortunei plantation.Journal of Central South University of Forestry and Technology (中南林业科技大学学报),2015,35(1):109-116 (in Chinese)
[23] Bao S-D (鲍士旦).Soil and Agricultural Chemistry Analysis.Beijing:China Agriculture Press,2000 (in Chinese)
[24] Xiang W-H (项文化),Huang Z-H (黄志宏),Yan W-D (闫文德),et al.Review on coupling of interactive functions between carbon and nitrogen cycles in forest ecosystems.Acta Ecologica Sinica (生态学报),2006,26(7):2365-2372 (in Chinese)
[25] Zheng S-X (郑淑霞),Shangguan Z-P (上官周平).Spatial distribution pattern of nutrient composition in plant leaves in Loess Plateau region.Progress in Natural Science (自然科学进展),2006,16(8):965-973 (in Chinese)
[26] Cheng J-M (程积民),Cheng J (程杰),Yang X-M (杨晓梅),et al.Spatial distribution of carbon density in grassland vegetation of the Loess Plateau of China.Acta Ecologica Sinica (生态学报),2012,32(1):226-237 (in Chinese)
[27] Zeng D-P (曾冬萍),Jiang L-L (蒋利玲),Zeng C-S (曾从盛),et al.Reviews on the ecological stoichiome-try characteristics and its applications.Acta Ecologica Sinica (生态学报),2013,33(18):5484-5492 (in Chinese)
[28] Schenk HJ,Jackson RB.Rooting depths,lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems.Journal of Ecology,2002,90:480-494
[29] Zhang Z-X (张志霞),Xu M-X (许明祥),Shi C-D (师晨迪),et al.Scaling effect on spatial variability of soil organic carbon in different geomorphic units on the loess hilly region.Journal of Natural Resources (自然资源学报),2014,29(7):1173-1184 (in Chinese)
[30] Zhang X-R (张向茹),Ma L-S (马露莎),Chen Y-N (陈亚南),et al.Ecological stoichiometry characteristics of Robinia pseudoacacia forest soil in different latitudes of Loss Plateau.Acta Pedologica Sinica (土壤学报),2013,50(4):818-825 (in Chinese)
[31] Wu J-P (吴建平),Han X-H (韩新辉),Xu Y-D (许亚东),et al.Ecological stoichiometry of soil and soil microbial biomass C,N,P under Grain-to-Green Program in loess hilly region.Acta Agrestia Sinica (草地学报),2016,24(4):783-792 (in Chinese)
[32] Zhu Q-L (朱秋莲),Xing X-Y (邢肖毅),Zhang H (张宏),et al.Soil ecological stoichiometry under different vegetation area on loess hilly gully region.Acta Ecologica Sinica (生态学报),2013,33(15):4674-4682 (in Chinese)
[33] Zou J-L (邹俊亮),Guo S-L (郭胜利),Li Z (李泽),et al.Soil organic carbon accumulation and distribution in a small watershed and the effects of soil water.Journal of Natural Resources (自然资源学报),2012,27(3):430-439 (in Chinese)
[34] Zhou P (周萍),Liu G-B (刘国彬),Hou X-L (侯喜禄).Biomass and species diversity of herbosa at different position and aspects of slope in the hilly-gully region of Loess Plateau.Science of Soil and Water Conservation (中国水土保持科学),2009,7(1):67-73 (in Chinese)
[35] Zhang Q (张庆),Niu J-M (牛建明),Alexander B,et al.Vegetation differentiation and soil effect at diffe-rent slope locations:A case study of Stipa breviflora grassland in Inner Mongolia,China.Chinese Journal of Plant Ecology (植物生态学报),2011,35(11):1167-1181 (in Chinese)
[36] Du F (杜峰),Liang Z-S (梁宗锁),Xu X-X (徐学选),et al.The community biomass of abandoned farmland and its effects on soil nutrition in the loess hilly region of Northern Shaanxi,China.Acta Ecologica Sinica (生态学报),2007,27(5):1673-1683 (in Chinese)
[37] Tian HQ,Chen GS,Zhang C,et al.Pattern and variation of C:N:P ratios in China’s soils:A synthesis of observational data.Biogeochemistry,2010,98:139-151
[38] Yang J-J (杨佳佳),Zhang X-R (张向茹),Ma L-S (马露莎),et al.Ecological stoichiometric relationships between components of Robinia pseudoacacia forest in loess plateau.Acta Pedologica Sinica (土壤学报),2014,51(1):133-142 (in Chinese)
[39] Wang Y-L (王彦龙),Ma Y-S (马玉寿),Shi J-J (施建军),et al.Investigation of biomass and soil nutrition of different vegetation type at alpine meadow in Yellow River Headwater Area.Acta Agrestia Sinica (草地学报),2011,19(1):1-6 (in Chinese)
[40] Fang H-D (方海东),Wei Y-L (魏雅丽),Liu G-C (刘刚才),et al.Effects of soil nutrients on planted Leucaena leucocephala forest in the dry-hot Jinshajiang River Valley.Arid Zone Research (干旱区研究),2011,28(2):229-234 (in Chinese)
[41] Critchley CNR,Chambers BJ,Fowbert JA,et al.Association between lowland grassland plant communities and soil properties.Biological Conservation,2002,105:199-215
[42] Yuan ZY,Chen HYH.Global trends in senesced-leaf nitrogen and phosphorus.Global Ecology and Biogeography,2009,18:532-542
[43] Ru H-L (汝海丽),Zhang H-D (张海东),Jiao F (焦峰),et al.Plant and soil C,N,P stoichiometric cha-racteristics in relation to micro-topography in the hilly loess plateau region,China.Journal of Natural Resources (自然资源学报),2016,31(10):1752-1763 (in Chinese)
[2] Zhou P (周萍),Liu G-B (刘国彬),Hou X-L (侯喜禄).Study on vegetation and soil nutrient characters of Artemisia sacrorum communities in hilly-gully region of the Loess Plateau.Acta Prataculturae Sinica (草业学报),2008,17(2):9-18 (in Chinese)
[3] Zhang W-Y (张文彦),Fan J-W (樊江文),Zhong H-P (钟华平),et al.The nitrogen:phosphorus stoichio-metry of different plant functional groups for dominant species of typical steppes in China.Acta Agrestia Sinica (草地学报),2010,18(4):503-509 (in Chinese)
[4] Ren S-J (任书杰),Yu G-R (于贵瑞),Jiang C-M (姜春明),et al.Stoichiometric characteristics of leaf carbon,nitrogen,and phosphorus of 102 dominant species in forest ecosystems along the North-South Transect of East China.Chinese Journal of Applied Ecology (应用生态学报),2012,23(3):581-586 (in Chinese)
[5] Ren S-J (任书杰),Yu G-R (于贵瑞),Tao B (陶波),et al.Leaf nitrogen and phosphorus stoichiometry across 654 terrestrial plant species in NSTEC.Environmental Science (环境科学),2007,28(12):2665-2673 (in Chinese)
[6] Hara M,Hirata K,Fujihara M,et al.Vegetation structure in relation to micro-landform in an evergreen broad-leaved forest on Amami Ohshima Island,south-west Japan.Ecological Research,1996,11:325-337
[7] Yang Y-C (杨永川),Da L-J (达良俊).A brief review of studies on differentation of vegetation pattern along a topographic gradient in hilly regions.Chinese Journal of Plant Ecology (植物生态学报),2006,30(3):504-513 (in Chinese)
[8] Gong X,Brueck H,Giese KM,et al.Slope aspect has effects on productivity and species composition of hilly grassland in the Xilin River Basin,Inner Mongolia,China.Journal of Arid Environments,2008,72:483-493
[9] Wallace KJ,Laughlin DC,Clarkson BD.Exotic weeds and fluctuating microclimate can constrain native plant regeneration in urban forest restoration.Ecological Applications,2017,27:1268
[10] Liu M-X (刘旻霞).Plant Community Composition and Nitrogen-phosphorus Stoichiometry along a Slope Aspect Gradient in An Alpine Meadow.PhD Thesis.Lanzhou:Lanzhou University,2013 (in Chinese)
[11] Fravolini G,Egli M,Derungs C,et al.Soil attributes and microclimate are important drivers of initial deadwood decay in sub-alpine Norway spruce forests.Science of the Total Environment,2016,569-570:1064-1076
[12] Kraft NJ,Valencia R,Ackerly DD.Functional traits and niche-based tree community assembly in an Amazonian forest.Science,2008,322:580-582
[13] Lin L-W (林兰稳),Yu W-M (余炜敏),Xiao Z-Q (肖振奇),et al.The relation of the growth of Schizostachyum funghomii plantation to site condition.Ecology and Environmental Sciences (生态环境学报),2011,20(1):88-90 (in Chinese)
[14] Qi J (祁建),Ma K-M (马克明),Zhang Y-X (张育新).Comparisons on leaf traits of Quercus liaotungensis Koidz.on different slope positions in Dongling Moutain of Beijing.Acta Ecologica Sinica (生态学报),2008,28(1):122-128 (in Chinese)
[15] Zhang T (张婷),Chen Y-M (陈云明),Wu C-H (武春华).Change of underground biomass and soil fertility with restoration stages of Artemisia gmelinii and Stipa bungeana in loess hilly region.Science of Soil and Water Conservation (中国水土保持科学),2011,9(5):91-97 (in Chinese)
[16] Ma X-H (马祥华),Jiao J-Y (焦菊英).Characteristics of vegetation with natural restoration in removal lands in loess hilly-gully region and the relationship between the characteristics and soil environment.Science of Soil and Water Conservation (中国水土保持科学),2005,3(2):15-22 (in Chinese)
[17] Xu H-M (许红梅),Gao Q (高琼),Huang Y-M (黄永梅),et al.Photosynthetic characteristics of six plant species in a forest steppe of the Loess Plateau,China.Chinese Journal of Plant Ecology (植物生态学报),2004,28(2):157-163 (in Chinese)
[18] Wang G-L (王国梁),Liu G-B (刘国彬),Xu M-X (许明祥).Effect of vegetation restoration on soil nutrient changes in Zhifanggou Watershed of loess hilly region.Bulletin of Soil and Water Conservation (水土保持通报),2002,22(1):1-5 (in Chinese)
[19] Bai W-J (白文娟),Zheng F-L (郑粉莉),Dong L-L (董莉丽),et al.Leaf traits of species in different habits in the water-wind erosion region of the Loess Plateau.Acta Ecologica Sinica (生态学报),2010,30(10):2529-2540 (in Chinese)
[20] Tilman D,Reich PB,Knops J,et al.Diversity and productivity in a long-term grassland experiment.Science,2001,294:843-845
[21] Kou M (寇萌),Jiao J-Y (焦菊英),Du H-D (杜华栋),et al.The altitudinal variation of leaf traits of Quercus liaotungensis and associated environmental explanations.Journal of Northwest Forestry University (西北林学院学报),2013,28(1):12-18 (in Chinese)
[22] Zhang S-P (张顺平),Qiao J (乔杰),Sun X-Y (孙向阳),et al.Effects of slope aspect and slope position on spatial distribution of soil nutrients of Paulownia fortunei plantation.Journal of Central South University of Forestry and Technology (中南林业科技大学学报),2015,35(1):109-116 (in Chinese)
[23] Bao S-D (鲍士旦).Soil and Agricultural Chemistry Analysis.Beijing:China Agriculture Press,2000 (in Chinese)
[24] Xiang W-H (项文化),Huang Z-H (黄志宏),Yan W-D (闫文德),et al.Review on coupling of interactive functions between carbon and nitrogen cycles in forest ecosystems.Acta Ecologica Sinica (生态学报),2006,26(7):2365-2372 (in Chinese)
[25] Zheng S-X (郑淑霞),Shangguan Z-P (上官周平).Spatial distribution pattern of nutrient composition in plant leaves in Loess Plateau region.Progress in Natural Science (自然科学进展),2006,16(8):965-973 (in Chinese)
[26] Cheng J-M (程积民),Cheng J (程杰),Yang X-M (杨晓梅),et al.Spatial distribution of carbon density in grassland vegetation of the Loess Plateau of China.Acta Ecologica Sinica (生态学报),2012,32(1):226-237 (in Chinese)
[27] Zeng D-P (曾冬萍),Jiang L-L (蒋利玲),Zeng C-S (曾从盛),et al.Reviews on the ecological stoichiome-try characteristics and its applications.Acta Ecologica Sinica (生态学报),2013,33(18):5484-5492 (in Chinese)
[28] Schenk HJ,Jackson RB.Rooting depths,lateral root spreads and below-ground/above-ground allometries of plants in water-limited ecosystems.Journal of Ecology,2002,90:480-494
[29] Zhang Z-X (张志霞),Xu M-X (许明祥),Shi C-D (师晨迪),et al.Scaling effect on spatial variability of soil organic carbon in different geomorphic units on the loess hilly region.Journal of Natural Resources (自然资源学报),2014,29(7):1173-1184 (in Chinese)
[30] Zhang X-R (张向茹),Ma L-S (马露莎),Chen Y-N (陈亚南),et al.Ecological stoichiometry characteristics of Robinia pseudoacacia forest soil in different latitudes of Loss Plateau.Acta Pedologica Sinica (土壤学报),2013,50(4):818-825 (in Chinese)
[31] Wu J-P (吴建平),Han X-H (韩新辉),Xu Y-D (许亚东),et al.Ecological stoichiometry of soil and soil microbial biomass C,N,P under Grain-to-Green Program in loess hilly region.Acta Agrestia Sinica (草地学报),2016,24(4):783-792 (in Chinese)
[32] Zhu Q-L (朱秋莲),Xing X-Y (邢肖毅),Zhang H (张宏),et al.Soil ecological stoichiometry under different vegetation area on loess hilly gully region.Acta Ecologica Sinica (生态学报),2013,33(15):4674-4682 (in Chinese)
[33] Zou J-L (邹俊亮),Guo S-L (郭胜利),Li Z (李泽),et al.Soil organic carbon accumulation and distribution in a small watershed and the effects of soil water.Journal of Natural Resources (自然资源学报),2012,27(3):430-439 (in Chinese)
[34] Zhou P (周萍),Liu G-B (刘国彬),Hou X-L (侯喜禄).Biomass and species diversity of herbosa at different position and aspects of slope in the hilly-gully region of Loess Plateau.Science of Soil and Water Conservation (中国水土保持科学),2009,7(1):67-73 (in Chinese)
[35] Zhang Q (张庆),Niu J-M (牛建明),Alexander B,et al.Vegetation differentiation and soil effect at diffe-rent slope locations:A case study of Stipa breviflora grassland in Inner Mongolia,China.Chinese Journal of Plant Ecology (植物生态学报),2011,35(11):1167-1181 (in Chinese)
[36] Du F (杜峰),Liang Z-S (梁宗锁),Xu X-X (徐学选),et al.The community biomass of abandoned farmland and its effects on soil nutrition in the loess hilly region of Northern Shaanxi,China.Acta Ecologica Sinica (生态学报),2007,27(5):1673-1683 (in Chinese)
[37] Tian HQ,Chen GS,Zhang C,et al.Pattern and variation of C:N:P ratios in China’s soils:A synthesis of observational data.Biogeochemistry,2010,98:139-151
[38] Yang J-J (杨佳佳),Zhang X-R (张向茹),Ma L-S (马露莎),et al.Ecological stoichiometric relationships between components of Robinia pseudoacacia forest in loess plateau.Acta Pedologica Sinica (土壤学报),2014,51(1):133-142 (in Chinese)
[39] Wang Y-L (王彦龙),Ma Y-S (马玉寿),Shi J-J (施建军),et al.Investigation of biomass and soil nutrition of different vegetation type at alpine meadow in Yellow River Headwater Area.Acta Agrestia Sinica (草地学报),2011,19(1):1-6 (in Chinese)
[40] Fang H-D (方海东),Wei Y-L (魏雅丽),Liu G-C (刘刚才),et al.Effects of soil nutrients on planted Leucaena leucocephala forest in the dry-hot Jinshajiang River Valley.Arid Zone Research (干旱区研究),2011,28(2):229-234 (in Chinese)
[41] Critchley CNR,Chambers BJ,Fowbert JA,et al.Association between lowland grassland plant communities and soil properties.Biological Conservation,2002,105:199-215
[42] Yuan ZY,Chen HYH.Global trends in senesced-leaf nitrogen and phosphorus.Global Ecology and Biogeography,2009,18:532-542
[43] Ru H-L (汝海丽),Zhang H-D (张海东),Jiao F (焦峰),et al.Plant and soil C,N,P stoichiometric cha-racteristics in relation to micro-topography in the hilly loess plateau region,China.Journal of Natural Resources (自然资源学报),2016,31(10):1752-1763 (in Chinese)