中国栽培草地氮磷流动空间特征
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摘要
【目的】中国畜牧业快速发展,对牧草需求日益增加,种植业结构调改已成为必然趋势。定量研究栽培草地的氮磷流动特征,可为优化牧草施肥和提高牧草产量提供科学依据。【方法】以苜蓿、黑麦草和燕麦草为研究对象,建立中国主要栽培牧草氮磷养分输入(输出)数据库,利用NUFER模型定量中国主要栽培牧草氮磷平衡账户、利用率和环境排放特征。【结果】(1)2014年,全国苜蓿、黑麦草和燕麦草草地氮输入(输出)总量分别为1 547、236和67 Gg,磷输入(输出)总量分别为323、44和16 Gg。单位面积苜蓿、黑麦草和燕麦草草地的氮输入(输出)量分别为326、427和217 kg N·hm~(-2),磷输入(输出)量分别为49、18和35 kg P·hm~(-2)。生物固氮是苜蓿草地氮的最主要输入项,占总输入量的51%,氮肥占黑麦草草地氮总输入量的93%,占燕麦草地总输入量的84%。磷肥是3种牧草磷的最主要输入项。(2)2014年,全国苜蓿、黑麦草和燕麦草的氮利用率分别为64%、93%和69%;磷利用率分别为28%、77%和34%。不同区域氮磷利用率差异很大。(3)2014年,单位面积苜蓿、黑麦草和燕麦草草地的氮环境排放量分别为23、4.0和9.9 kg N·hm~(-2),磷的环境排放量分别为2.6、3.8和2.6 kg P·hm~(-2)。西南地区苜蓿和黑麦草的氮磷环境排放量较高,西部各地区燕麦草草地氮磷环境排放量高于其他区域。(4)2014年,黑麦草草地氮呈亏缺态,其余栽培草地氮磷均有不同程度的盈余。中国西部地区苜蓿的土壤氮磷累积量高于东部地区;黑麦草的土壤氮磷累积量没有明显规律;青藏高原区燕麦草的土壤氮磷累积量大于其他区域。【结论】2014年,全国栽培苜蓿、黑麦草和燕麦草草地的氮磷输入(输出)量差异较大。生物固氮是苜蓿获取氮素的重要途径,田间管理需减少氮肥投入,燕麦和黑麦草主要通过化肥获取所需养分,应注重肥料施用。3种栽培牧草氮的利用率均高于60%,磷的利用率相对较低。黑麦草草地氮呈亏缺态,需增施氮肥,其余栽培草地氮磷均有不同程度的盈余,应控制肥料过多施用。
【Objective】With the rapid development of animal husbandry in China and the increasing demand for forage, the adjustment of planting structure has become an inevitable trend. The objective of this study is to quantify the nitrogen(N) and phosphorus(P) spatial flow of cultivated forage, and to provide a scientific basis for increasing grassland productivity. 【Method】Taking alfalfa, ryegrass and oat grass as target forage species, the database of N and P input and output was established, the nutrient balance budgets, nutrient use efficiency and environmental emissions were quantified in cultivated grassland of China by using NUFER model. 【Result】(1) In 2014, the total input(output) of N in alfalfa, ryegrass and oat grassland of China was 1 547, 236 and 67 Gg, respectively. The N input(output) of per unit area in alfalfa, ryegrass and oat grass grassland of China was 326, 427 and 217 kg N·hm~(-2), respectively. The total input(output) of P in alfalfa, ryegrass and oat grass grassland of China was 323, 44 and 16 Gg and the P input(output) of per unit area was 49, 18 and 35 kg P·hm~(-2), respectively. N fixation was the largest input item for alfalfa which accounted for 51% of the total N input into alfalfa grassland. N fertilizer was the largest input item for oat grass and ryegrass which accounted for 93% and 84% of the total N input into ryegrass and oat grass grassland, respectively. P fertilizer was the most important input of P in these kinds of forage.(2) In 2014, the nitrogen use efficiency(NUE) of alfalfa, ryegrass and oat grass grassland was 64%, 93% and 69%, respectively. The phosphorus use efficiency(PUE) was 28%, 77% and 34%, respectively. The NUE and PUE varied greatly in different regions.(3) In 2014, the N loss of alfalfa, ryegrass and oat grass grassland per unit area was 23, 4.0 and 9.9 kg N·hm~(-2) and the P loss of them was 2.6, 3.8 and 2.6 kg P·hm~(-2), respectively. The N and P loss of alfalfa and ryegrass grassland in Southwest China was higher than that in other regions. The N and P loss of oat grass grassland in Western China was higher than that in other regions.(4) In 2014, the N and P accumulation of cultivated grassland were positive except for N accumulation in ryegrass grassland. The accumulation rate of alfalfa grassland in Western China was higher than that in Eastern China. There was no regular regional change of N and P accumulation for ryegrass grassland. The N and P accumulation rate of oat grass grassland in Tibet Plateau was higher than that in other regions. 【Conclusion】In 2014, there was a large gap of N and P input(output) for alfalfa, ryegrass and oat grass grassland in different regions of China. N fixation was the major way for alfalfa to acquire N nutrition, so alfalfa grassland management should reduce the input of N fertilizer. Oat grass and ryegrass mainly get the required nutrients by chemical fertilizer, so it should pay attention to fertilizer application for oat grass and ryegrass grassland. The NUE of target forage species was higher than 60%, but PUE was relatively low. Ryegrass grassland was deficient in N, and it is necessary to apply more nitrogen fertilizer. Other cultivated grasslands had surplus of N and P in varying degrees, so the excessive application of fertilizer should be controlled.
【Objective】With the rapid development of animal husbandry in China and the increasing demand for forage, the adjustment of planting structure has become an inevitable trend. The objective of this study is to quantify the nitrogen(N) and phosphorus(P) spatial flow of cultivated forage, and to provide a scientific basis for increasing grassland productivity. 【Method】Taking alfalfa, ryegrass and oat grass as target forage species, the database of N and P input and output was established, the nutrient balance budgets, nutrient use efficiency and environmental emissions were quantified in cultivated grassland of China by using NUFER model. 【Result】(1) In 2014, the total input(output) of N in alfalfa, ryegrass and oat grassland of China was 1 547, 236 and 67 Gg, respectively. The N input(output) of per unit area in alfalfa, ryegrass and oat grass grassland of China was 326, 427 and 217 kg N·hm~(-2), respectively. The total input(output) of P in alfalfa, ryegrass and oat grass grassland of China was 323, 44 and 16 Gg and the P input(output) of per unit area was 49, 18 and 35 kg P·hm~(-2), respectively. N fixation was the largest input item for alfalfa which accounted for 51% of the total N input into alfalfa grassland. N fertilizer was the largest input item for oat grass and ryegrass which accounted for 93% and 84% of the total N input into ryegrass and oat grass grassland, respectively. P fertilizer was the most important input of P in these kinds of forage.(2) In 2014, the nitrogen use efficiency(NUE) of alfalfa, ryegrass and oat grass grassland was 64%, 93% and 69%, respectively. The phosphorus use efficiency(PUE) was 28%, 77% and 34%, respectively. The NUE and PUE varied greatly in different regions.(3) In 2014, the N loss of alfalfa, ryegrass and oat grass grassland per unit area was 23, 4.0 and 9.9 kg N·hm~(-2) and the P loss of them was 2.6, 3.8 and 2.6 kg P·hm~(-2), respectively. The N and P loss of alfalfa and ryegrass grassland in Southwest China was higher than that in other regions. The N and P loss of oat grass grassland in Western China was higher than that in other regions.(4) In 2014, the N and P accumulation of cultivated grassland were positive except for N accumulation in ryegrass grassland. The accumulation rate of alfalfa grassland in Western China was higher than that in Eastern China. There was no regular regional change of N and P accumulation for ryegrass grassland. The N and P accumulation rate of oat grass grassland in Tibet Plateau was higher than that in other regions. 【Conclusion】In 2014, there was a large gap of N and P input(output) for alfalfa, ryegrass and oat grass grassland in different regions of China. N fixation was the major way for alfalfa to acquire N nutrition, so alfalfa grassland management should reduce the input of N fertilizer. Oat grass and ryegrass mainly get the required nutrients by chemical fertilizer, so it should pay attention to fertilizer application for oat grass and ryegrass grassland. The NUE of target forage species was higher than 60%, but PUE was relatively low. Ryegrass grassland was deficient in N, and it is necessary to apply more nitrogen fertilizer. Other cultivated grasslands had surplus of N and P in varying degrees, so the excessive application of fertilizer should be controlled.
引文
[1]李凌浩,路鹏,顾雪莹,毛小涛,高树琴,张英俊.人工草地建设原理与生产范式.科学通报,2016,61(2):193-200.LI L H,LU P,GU X Y,MAO X T,GAO S Q,ZHANG Y J.Principles and paradigms for developing artificial pastures.Chinese Science Bulletin,2016,61(2):193-200.(in Chinese)
[2]方精云,白永飞,李凌浩,蒋高明,黄建辉,黄振英,张文浩,高树琴.我国草原牧区可持续发展的科学基础与实践.科学通报,2016,61(2):155-164.FANG J Y,BAI Y F,LI L H,JIANG G M,HUANG J H,HUANG Z Y,ZHANG W H,GAO S Q.Scientific basis and practical ways for sustainable development of China’s pasture regions.Chinese Science Bulletin,2016,61(2):155-164.(in Chinese)
[3]沈海花,朱言坤,赵霞,耿晓庆,高树琴,方精云.中国草地资源的现状分析.科学通报,2016,61(2):139-154.SHEN H H,ZHU Y K,ZHAO X,GENG X Q,GAO S Q,FANG J Y.Analysis of current grassland resources in China.Chinese Science Bulletin,2016,61(2):139-154.(in Chinese)
[4]全国畜牧总站.中国草业统计.http://www.digitalgrss.cn,2015.National Animal Husbandry Station.China Grass Industry Statistics.http://www.digitalgrss.cn,2015.(in Chinese)
[5]中共中央国务院.中央一号文件.http://www.farmer.com.cn/uzt/ywj/gea/201601/t20160128_1176612_2.htm,2016.The State Council of China.The central first document.http://www.farmer.com.cn/uzt/ywj/gea/201601/t20160128_1176612_2.htm,2016.(in Chinese)
[6]洪绂曾,王元素.中国南方人工草地畜牧业回顾与思考.中国草地学报,2006,28(2):71-75,78.HONG F Z,WANG Y S.The strategical thinking of grassland agriculture in Southern China.Chinese Journal of Grassland,2006,28(2):71-75,78.(in Chinese)
[7]张新时,唐海萍,董孝斌,李波,黄永梅,龚吉蕊.中国草原的困境及其转型.科学通报,2016,61(2):165-177.ZHANG X S,TANG H P,DONG X B,LI B,HUANG Y M,GONG JR.The dilemma of steppe and it’s transformation in China.Chinese Science Bulletin,2016,61(2):165-177.(in Chinese)
[8]O’MARA F P.The role of grasslands in food security and climate change.Annals of Botany,2012,110(6):1263-1270.
[9]国家牧草产业技术体系.中国栽培草地.北京:科学出版社,2015.National Technical System of Grass Industry.Chinese Cultivated Grassland.Beijing:Science Press,2015.(in Chinese)
[10]RIVERO D S,VILLAMIL A M S,MAHECHA O M,TERAN A M,RIVERO M S,NAVARRO A M S.Evaluation of the effect of two types of fertilizer on the growth,development and productivity of hydroponic green forage oat(Avena sativa L.)and ryegrass(Lolium multiflorum Lam.)as a biomass source.Chemical Engineering Transactions,2016,50:385-390.
[11]李小坤,鲁剑巍,刘晓伟,刘威,潘福霞,魏云霞.配方施肥对一年生黑麦草产草量及品质的影响.草业科学,2011,28(9):1666-1670.LI X K,LU J W,LIU X W,LIU W,PAN F X,WEI Y X.Effect of fertilization on the yield and forage quality of annual ryegrass.Pratacultural Science,2011,28(9):1666-1670.(in Chinese)
[12]张菁,张于卉,马力,周鹏,安渊.播期和施肥对冬闲田紫花苜蓿生长和品质的影响.中国草地学报,2015,37(6):35-41.ZHANG J,ZHANG Y H,MA L,ZHOU P,AN Y.Effect of sowing data and applying fertilizer on growth and quality of alfalfa in winter fallow land.Chinese Journal of Grassland,2015,37(6):35-41.(in Chinese)
[13]陶雪,苏德荣,寇丹,乔阳.西北旱区灌溉方式对苜蓿生长及水分利用率的影响.草地学报,2016,24(1):114-120.TAO X,SU D R,KOU D,QIAO Y.Effect of irrigation methods on growth and water use efficiency of alfalfa in arid Northwest China.Acta Agrestia Sinica,2016,24(1):114-120.(in Chinese)
[14]陈萍,沈振荣,迟海峰,杨东海,谷传申,杜婉君,鲍举文.不同施肥处理对紫花苜蓿产量和株高的影响.作物杂志,2013(1):91-94.CHEN P,SHEN Z R,CHI H F,YANG D H,GU C S,DU W J,BAO JW.Effects of different fertilization on output and plant height of alfalfa.Crops,2013(1):91-94.(in Chinese)
[15]肖相芬,周川姣,周顺利,胡跃高,任长忠,郭来春,王春龙.燕麦氮吸收利用特性与适宜施氮量的定位研究.中国农业科学,2011,44(22):4618-4626.XIAO X F,ZHOU C J,ZHOU S L,HU Y G,REN C Z,GUO L C,WANG C L.Characteristics of N absorption,utilization and optimum N-fertilizer rate based on a long-term fertilization experiment of oats.Scientia Agricultura Sinica,2011,44(22):4618-4626.(in Chinese)
[16]LI W X,LU J W,CHEN F,LI X K.Effect of NPK application on yield,nutrients and water utilization under sudangrass and ryegrass rotation regime.Agricultural Sciences in China,2010,9(7):1026-1034.
[17]顾梦鹤,王涛,杜国祯.施肥对高寒地区多年生人工草地生产力及稳定性的影响.兰州大学学报(自然科学版),2010,46(6):59-63.GU M H,WANG T,DU G Z.Effects of fertilization on productivity and stability of cultivated grassland in an alpine region.Journal of Lanzhou University(Natural Sciences),2010,46(6):59-63.(in Chinese)
[18]杨曾平,聂军,廖育林,周兴,谢坚,鲁艳红,纪雄辉,吴家梅,谢运河.不同施肥量对稻田一年生黑麦草产量及氮磷钾吸收的影响.中国农学通报,2015,31(30):173-180.YANG Z P,NIE J,LIAO Y L,ZHOU X,XIE J,LU Y H,JI X H,WUJ M,XIE Y H.Effect of different fertilizations on biomass yield and N,P,K absorption of annual ryegrass in rice field.Chinese Agricultural Science Bulletin,2015,31(30):173-180.(in Chinese)
[19]GU B J,JU X T,CHANG S X,GE Y,CHANG J.Nitrogen use efficiencies in Chinese agricultural systems and implications for food security and environmental protection.Regional Environmental Change,2017,17(4):1217-1227.
[20]ZHOU Q K,DARYANTO S,XIN Z M,LIIU Z M,LIU M H,CUI X,WANG L X.Soil phosphorus budget in global grasslands and implications for management.Journal of Arid Environments,2017,144:224-235.
[21]马林.中国食物链氮素流动规律及调控策略[D].保定:河北农业大学,2010.MA L.Mechanism and regulatory strategies of nitrogen flow in food chain of China[D].Baoding:Hebei Agricultural University,2010.(in Chinese)
[22]MA L,MA W Q,VELTHOF G L,WANG F H,QIN W,ZHANG F S,OENEMA O.Modeling nutrient flows in the food chain of China.Journal of Environmental Quality,2010,39(4):1279-1289.
[23]LIU X J,ZHANG Y,HAN W X,TANG A H,SHEN J L,CUI Z L,VITOUSEK P,ERISMAN J W,GOULDING K,CHRISTIE P,FANGMEIER A,ZHANG F S.Enhanced nitrogen deposition over China.Nature,2013,494(7438):459-462.
[24]ZHU J,WANG Q,HE N,SMITH M D,ELSER J J,DU J,YUAN G,YU G,YU Q.Imbalanced atmospheric nitrogen and phosphorus depositions in China:Implications for nutrient limitation.Journal of Geophysical Research:Biogeosciences,2016,121(6):1605-1616.
[25]陈敏鹏,陈吉宁.中国种养系统的氮流动及其环境影响.环境科学,2007,28(10):2342-2349.CHEN M P,CHEN J N.Nitrogen flow in farming-feeding system and its environmental impact in China.Environmental Science,2007,28(10):2342-2349.(in Chinese)
[26]王激清,马文奇,江荣风,张福锁.中国农田生态系统氮素平衡模型的建立及其应用.农业工程学报,2007,23(8):210-215.WANG J Q,MA W Q,JIANG R F,ZHANG F S.Development and application of nitrogen balance model of agro-ecosystem in China.Transactions of the CSAE,2007,23(8):210-215.(in Chinese)
[27]CARLSSON G,HUSS-DANELL K.Nitrogen fixation in perennial forage legumes in the field.Plant and Soil,2003,253(2):353-372.
[28]国家牧草产业技术体系.牧草标准化生产管理技术规范.北京:科学出版社,2014.National Technical System of Grass Industry.Technical Specification Standardized Production and Management of Forage.Beijing:Science Press,2014.(in Chinese)
[29]任继周,胥刚,李向林,林慧龙,唐增.中国草业科学的发展轨迹与展望.科学通报,2016,61(2):178-192.REN J Z,XU G,LI X L,LIN H L,TANG Z.Trajectory and prospect of China’s prataculture.Chinese Science Bulletin,2016,61(2):178-192.(in Chinese)
[30]罗付香,林超文,朱永群,姚莉,张建华,王谦.氮肥用量对四川紫色丘陵区水稻氮素吸收及土壤氮素表观平衡的影响.西南农业学报,2016,29(8):1093-1097.LUO F X,LIN C W,ZHU Y Q,YAO L,ZHANG J H,WANG Q.Effect of nitrogen fertilizer amount on rice nitrogen uptake and soil nitrogen apparent balance of Sichuan purple hilly region.Southwest China Journal of Agricultural Sciences,2016,29(8):1093-1097.(in Chinese)
[31]VITOUSEK P M,NAYLOR R,CREWS T,DAVID M B,DRINKWATER L E,HOLLAND E,JOHNES P J,KATZENBERGER J,MARTINELLI L A,MATSON P A,NZIGUHEBA G,OJIMA D,PALMC A,ROBERTSON G P,SANCHEZ P A,TOWNSEND A R,ZHANGF S.Nutrient imbalances in agricultural development.Science,2009,324(5934):1519-1520.
[2]方精云,白永飞,李凌浩,蒋高明,黄建辉,黄振英,张文浩,高树琴.我国草原牧区可持续发展的科学基础与实践.科学通报,2016,61(2):155-164.FANG J Y,BAI Y F,LI L H,JIANG G M,HUANG J H,HUANG Z Y,ZHANG W H,GAO S Q.Scientific basis and practical ways for sustainable development of China’s pasture regions.Chinese Science Bulletin,2016,61(2):155-164.(in Chinese)
[3]沈海花,朱言坤,赵霞,耿晓庆,高树琴,方精云.中国草地资源的现状分析.科学通报,2016,61(2):139-154.SHEN H H,ZHU Y K,ZHAO X,GENG X Q,GAO S Q,FANG J Y.Analysis of current grassland resources in China.Chinese Science Bulletin,2016,61(2):139-154.(in Chinese)
[4]全国畜牧总站.中国草业统计.http://www.digitalgrss.cn,2015.National Animal Husbandry Station.China Grass Industry Statistics.http://www.digitalgrss.cn,2015.(in Chinese)
[5]中共中央国务院.中央一号文件.http://www.farmer.com.cn/uzt/ywj/gea/201601/t20160128_1176612_2.htm,2016.The State Council of China.The central first document.http://www.farmer.com.cn/uzt/ywj/gea/201601/t20160128_1176612_2.htm,2016.(in Chinese)
[6]洪绂曾,王元素.中国南方人工草地畜牧业回顾与思考.中国草地学报,2006,28(2):71-75,78.HONG F Z,WANG Y S.The strategical thinking of grassland agriculture in Southern China.Chinese Journal of Grassland,2006,28(2):71-75,78.(in Chinese)
[7]张新时,唐海萍,董孝斌,李波,黄永梅,龚吉蕊.中国草原的困境及其转型.科学通报,2016,61(2):165-177.ZHANG X S,TANG H P,DONG X B,LI B,HUANG Y M,GONG JR.The dilemma of steppe and it’s transformation in China.Chinese Science Bulletin,2016,61(2):165-177.(in Chinese)
[8]O’MARA F P.The role of grasslands in food security and climate change.Annals of Botany,2012,110(6):1263-1270.
[9]国家牧草产业技术体系.中国栽培草地.北京:科学出版社,2015.National Technical System of Grass Industry.Chinese Cultivated Grassland.Beijing:Science Press,2015.(in Chinese)
[10]RIVERO D S,VILLAMIL A M S,MAHECHA O M,TERAN A M,RIVERO M S,NAVARRO A M S.Evaluation of the effect of two types of fertilizer on the growth,development and productivity of hydroponic green forage oat(Avena sativa L.)and ryegrass(Lolium multiflorum Lam.)as a biomass source.Chemical Engineering Transactions,2016,50:385-390.
[11]李小坤,鲁剑巍,刘晓伟,刘威,潘福霞,魏云霞.配方施肥对一年生黑麦草产草量及品质的影响.草业科学,2011,28(9):1666-1670.LI X K,LU J W,LIU X W,LIU W,PAN F X,WEI Y X.Effect of fertilization on the yield and forage quality of annual ryegrass.Pratacultural Science,2011,28(9):1666-1670.(in Chinese)
[12]张菁,张于卉,马力,周鹏,安渊.播期和施肥对冬闲田紫花苜蓿生长和品质的影响.中国草地学报,2015,37(6):35-41.ZHANG J,ZHANG Y H,MA L,ZHOU P,AN Y.Effect of sowing data and applying fertilizer on growth and quality of alfalfa in winter fallow land.Chinese Journal of Grassland,2015,37(6):35-41.(in Chinese)
[13]陶雪,苏德荣,寇丹,乔阳.西北旱区灌溉方式对苜蓿生长及水分利用率的影响.草地学报,2016,24(1):114-120.TAO X,SU D R,KOU D,QIAO Y.Effect of irrigation methods on growth and water use efficiency of alfalfa in arid Northwest China.Acta Agrestia Sinica,2016,24(1):114-120.(in Chinese)
[14]陈萍,沈振荣,迟海峰,杨东海,谷传申,杜婉君,鲍举文.不同施肥处理对紫花苜蓿产量和株高的影响.作物杂志,2013(1):91-94.CHEN P,SHEN Z R,CHI H F,YANG D H,GU C S,DU W J,BAO JW.Effects of different fertilization on output and plant height of alfalfa.Crops,2013(1):91-94.(in Chinese)
[15]肖相芬,周川姣,周顺利,胡跃高,任长忠,郭来春,王春龙.燕麦氮吸收利用特性与适宜施氮量的定位研究.中国农业科学,2011,44(22):4618-4626.XIAO X F,ZHOU C J,ZHOU S L,HU Y G,REN C Z,GUO L C,WANG C L.Characteristics of N absorption,utilization and optimum N-fertilizer rate based on a long-term fertilization experiment of oats.Scientia Agricultura Sinica,2011,44(22):4618-4626.(in Chinese)
[16]LI W X,LU J W,CHEN F,LI X K.Effect of NPK application on yield,nutrients and water utilization under sudangrass and ryegrass rotation regime.Agricultural Sciences in China,2010,9(7):1026-1034.
[17]顾梦鹤,王涛,杜国祯.施肥对高寒地区多年生人工草地生产力及稳定性的影响.兰州大学学报(自然科学版),2010,46(6):59-63.GU M H,WANG T,DU G Z.Effects of fertilization on productivity and stability of cultivated grassland in an alpine region.Journal of Lanzhou University(Natural Sciences),2010,46(6):59-63.(in Chinese)
[18]杨曾平,聂军,廖育林,周兴,谢坚,鲁艳红,纪雄辉,吴家梅,谢运河.不同施肥量对稻田一年生黑麦草产量及氮磷钾吸收的影响.中国农学通报,2015,31(30):173-180.YANG Z P,NIE J,LIAO Y L,ZHOU X,XIE J,LU Y H,JI X H,WUJ M,XIE Y H.Effect of different fertilizations on biomass yield and N,P,K absorption of annual ryegrass in rice field.Chinese Agricultural Science Bulletin,2015,31(30):173-180.(in Chinese)
[19]GU B J,JU X T,CHANG S X,GE Y,CHANG J.Nitrogen use efficiencies in Chinese agricultural systems and implications for food security and environmental protection.Regional Environmental Change,2017,17(4):1217-1227.
[20]ZHOU Q K,DARYANTO S,XIN Z M,LIIU Z M,LIU M H,CUI X,WANG L X.Soil phosphorus budget in global grasslands and implications for management.Journal of Arid Environments,2017,144:224-235.
[21]马林.中国食物链氮素流动规律及调控策略[D].保定:河北农业大学,2010.MA L.Mechanism and regulatory strategies of nitrogen flow in food chain of China[D].Baoding:Hebei Agricultural University,2010.(in Chinese)
[22]MA L,MA W Q,VELTHOF G L,WANG F H,QIN W,ZHANG F S,OENEMA O.Modeling nutrient flows in the food chain of China.Journal of Environmental Quality,2010,39(4):1279-1289.
[23]LIU X J,ZHANG Y,HAN W X,TANG A H,SHEN J L,CUI Z L,VITOUSEK P,ERISMAN J W,GOULDING K,CHRISTIE P,FANGMEIER A,ZHANG F S.Enhanced nitrogen deposition over China.Nature,2013,494(7438):459-462.
[24]ZHU J,WANG Q,HE N,SMITH M D,ELSER J J,DU J,YUAN G,YU G,YU Q.Imbalanced atmospheric nitrogen and phosphorus depositions in China:Implications for nutrient limitation.Journal of Geophysical Research:Biogeosciences,2016,121(6):1605-1616.
[25]陈敏鹏,陈吉宁.中国种养系统的氮流动及其环境影响.环境科学,2007,28(10):2342-2349.CHEN M P,CHEN J N.Nitrogen flow in farming-feeding system and its environmental impact in China.Environmental Science,2007,28(10):2342-2349.(in Chinese)
[26]王激清,马文奇,江荣风,张福锁.中国农田生态系统氮素平衡模型的建立及其应用.农业工程学报,2007,23(8):210-215.WANG J Q,MA W Q,JIANG R F,ZHANG F S.Development and application of nitrogen balance model of agro-ecosystem in China.Transactions of the CSAE,2007,23(8):210-215.(in Chinese)
[27]CARLSSON G,HUSS-DANELL K.Nitrogen fixation in perennial forage legumes in the field.Plant and Soil,2003,253(2):353-372.
[28]国家牧草产业技术体系.牧草标准化生产管理技术规范.北京:科学出版社,2014.National Technical System of Grass Industry.Technical Specification Standardized Production and Management of Forage.Beijing:Science Press,2014.(in Chinese)
[29]任继周,胥刚,李向林,林慧龙,唐增.中国草业科学的发展轨迹与展望.科学通报,2016,61(2):178-192.REN J Z,XU G,LI X L,LIN H L,TANG Z.Trajectory and prospect of China’s prataculture.Chinese Science Bulletin,2016,61(2):178-192.(in Chinese)
[30]罗付香,林超文,朱永群,姚莉,张建华,王谦.氮肥用量对四川紫色丘陵区水稻氮素吸收及土壤氮素表观平衡的影响.西南农业学报,2016,29(8):1093-1097.LUO F X,LIN C W,ZHU Y Q,YAO L,ZHANG J H,WANG Q.Effect of nitrogen fertilizer amount on rice nitrogen uptake and soil nitrogen apparent balance of Sichuan purple hilly region.Southwest China Journal of Agricultural Sciences,2016,29(8):1093-1097.(in Chinese)
[31]VITOUSEK P M,NAYLOR R,CREWS T,DAVID M B,DRINKWATER L E,HOLLAND E,JOHNES P J,KATZENBERGER J,MARTINELLI L A,MATSON P A,NZIGUHEBA G,OJIMA D,PALMC A,ROBERTSON G P,SANCHEZ P A,TOWNSEND A R,ZHANGF S.Nutrient imbalances in agricultural development.Science,2009,324(5934):1519-1520.