不同沙化程度高寒草地土壤团聚体有机碳含量特征
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摘要
为了解高寒沙化草地土壤团聚体组成及其有机碳含量变化特征,对若尔盖四种不同沙化程度的高寒草地土壤团聚体有机碳进行了比较分析。结果表明:在川西北高寒草地中,随着草地沙化程度加剧,土壤中团聚体组成变化明显。当高寒草地从中度沙化向重度沙化转变阶段,≤0.25mm粒级团聚体的增加及0.5-2mm粒级团聚体的减少都较为显著。随着草地沙化程度的增加,土壤各粒级团聚体有机碳含量总体呈下降趋势,并且土壤团聚体有机碳含量的显著下降发生在草地从中度沙化向重度沙化转变阶段。
Tounderstand the composition and organic carbon characteristics of soil aggregates in alpine desertification grassland,the soil aggregate organic carbon of four desertificationgrasslands in Zoigewas compared.The results showed that the composition of soil aggregates changed significantly with the increase of grassland desertification in the alpine grassland of northwestern Sichuan.When the alpine grassland change from moderate to severe desertification level,the increase of≤0.25 mm aggregates and the decrease of 0.5-2 mm aggregates werequite significant.Theorganic carbon content ofsoil aggregates showed a decreasing trendwith the aggravation of grassland desertification level,and theorganic carbon content of soil aggregatesdecreased significantlyat the stage oftransition from moderate to severe desertification.
Tounderstand the composition and organic carbon characteristics of soil aggregates in alpine desertification grassland,the soil aggregate organic carbon of four desertificationgrasslands in Zoigewas compared.The results showed that the composition of soil aggregates changed significantly with the increase of grassland desertification in the alpine grassland of northwestern Sichuan.When the alpine grassland change from moderate to severe desertification level,the increase of≤0.25 mm aggregates and the decrease of 0.5-2 mm aggregates werequite significant.Theorganic carbon content ofsoil aggregates showed a decreasing trendwith the aggravation of grassland desertification level,and theorganic carbon content of soil aggregatesdecreased significantlyat the stage oftransition from moderate to severe desertification.
引文
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[2]Jastrow,J.D.Soil aggregate formation and the accrual of particulate and mineral-associated organic matter[J].Soil Biology and Biochemistry,1996,28(4).
[3]侯晓娜,李慧,朱刘兵等.生物炭与秸秆添加对砂姜黑土团聚体组成和有机碳分布的影响[J].中国农业科学,2015,48(04):705-712.
[4]孙家兴,赵雨森,辛颖等.黑土区杨树农田防护林土壤团聚体的稳定性[J].水土保持通报,2018,38(03):66-73.
[5]姬秀云,李玉华.黄土高原植被恢复对不同粒径土壤团聚体中酶活性的影响[J].水土保持通报,2018,38(01):24-28.
[6]陈文光.加强四川省草原治理建设长江黄河上游草地生态屏障-川西北草原退化沙化的调查与思考[J].四川草原,2002,12(03):1-4.
[7]蒙嘉文,左林,蔡应君等.若尔盖县土地沙化现状分析及治理对策研究[J].四川林业科技,2013,(4):46-50.
[8]陈杜军.若尔盖地区硒地球化学特征[D].成都理工大学,2013.
[9]J Six,H Bossuyt,S Degryze,et al.A history of research on the link between(micro)aggregates,soil biota,and soil organic matter dynamics[J].Soil and Tillage Research,2004,79(1):7-31.
[10]窦森,李凯,关松.土壤团聚体中有机质研究进展[J].土壤学报,2011,48(02):412-418.
[11]金红喜,何芳兰,李昌龙等.玛曲沙化高寒草甸植被、土壤理化性质及土壤微生物数量研究[J].草业学报,2015,24(11):20-28.
[12]曹丽花,刘合满,赵世伟.当雄退化草甸土壤有机碳分布特征及其与土壤主要养分的关系[J].中国农学通报,2011,27(24):69-73.