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不同利用方式对高寒草地土壤团聚体稳定性及其有机碳含量分布的影响 被引量:3

Effects of Different Land Utilization Methods on Soil Aggregate Stability and Organic Carbon Content in Alpine Grassland
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摘要 [目的]分析不同利用方式下新疆巴音布鲁克高寒草地土壤团聚体稳定性及其有机碳分布差异,为评价该区域土壤团聚体有机碳等生态功能提供理论基础。[方法]选取巴音布鲁克高寒草地开垦、弃耕还牧、放牧3种处理,以10 cm为一个梯度,采集0—40 cm土层土壤,采用干筛和湿筛两种方法筛分土壤团聚体,测算土壤团聚体的平均重量直径(MWD)、几何平均直径(GMD)、土壤团聚体破坏率(PDA)和土壤有机碳(SOC)含量,明确不同利用方式下高寒草地土壤团聚体稳定性及团聚体有机碳含量的差异。[结果]①3种利用方式下,高寒草地土壤团聚体均以大团聚体(≥0.25 mm粒径)为主。亚表层(10—20 cm)土壤,弃耕还牧处理的PDA显著低于放牧处理(p<0.05),与开垦处理无显著差异(p>0.05);而除亚表层(10—20 cm)外,弃耕还牧处理其余土层土壤PDA显著高于开垦处理和放牧处理(p<0.05)。表层(0—10 cm)土壤,开垦处理与放牧处理PDA无显著差异(p>0.05);而除表层(0—10 cm)外,开垦处理其余土层土壤PDA显著高于放牧处理。②弃耕还牧处理的SOC含量、土壤团聚体有机碳含量及贡献率均显著低于其他处理(p<0.05)。在表层(0—10 cm)土壤中,放牧处理≥5 mm粒径土壤团聚体有机碳含量及其贡献率显著高于开垦处理(27.89 g/kg,6.34%)和弃耕还牧处理(36.96 g/kg,14.3%)。而亚表层(10—20 cm)、下层(20—30 cm)、深层(30—40 cm),弃耕还牧处理≥5 mm粒径的土壤团聚体有机碳含量及其贡献率显著低于开垦处理和放牧处理(p<0.05)。③土壤团聚体质量百分比及其稳定性与SOC含量呈显著相关(p<0.05);≥2 mm土壤团聚体质量百分比、土壤团聚体MWD和GMD与SOC含量呈显著正相关(p<0.05),其中≥5 mm呈极显著正相关(p<0.01);<2 mm土壤团聚体质量百分比、土壤团聚体稳定性与SOC含量呈显著负相关(p<0.05),其中<1 mm呈极显著负相关(p<0.01)。[结论]草地开垦活动会降低土壤� [Objective]The soil aggregate stability and differences in organic carbon distribution for Bayanbulak alpine grassland,Xinjiang Wei Autonomous Region under different land utilization methods were analyzed in order to provide a theoretical basis for the evaluation of soil aggregate organic carbon and other ecological functions in this region.[Methods]Three land utilization methods for an alpine grassland in Bayinbuluk were evaluated:reclamation,abandoning farming to grazing,and grazing.Soil aggregates were screened by dry screening and wet screening,mean weight diameter(MWD),geometric mean diameter(GMD),percentage of aggregate destruction(PDA),and soil organic carbon(SOC)contents of soil aggregates were measured and calculated to quantify differences in soil aggregate stability and organic carbon in an alpine grassland under different land utilization methods.[Results]①Under the three land utilization methods,soil aggregates in an alpine grassland were primarily large aggregates(≥0.25 mm).In the subsurface(10—20 cm)soil,the PDA for the treatment of abandoning farming to grazing was significantly lower than that of the grazing treatment(p<0.05),and was not significantly different from the PDA for the reclamation treatment(p>0.05).In addition,the soil PDA values of the remaining soil layers in the treatment of abandoning farming to grazing were significantly greater than those observed for the reclamation treatment and the grazing treatment(p<0.05).In the surface layer(0—10 cm),there was no significant difference in PDA between the reclamation treatment and the grazing treatment(p>0.05).The PDA values of the other soil layers in the reclamation treatment were significantly greater than in the grazing treatment.②The SOC content,soil aggregate organic carbon content,and the contribution rate of soil aggregates in the treatment of abandoning farming to grazing were significantly less than those in the other treatments(p<0.05).In the 0—10 cm soil layer,organic carbon content and its contribution rate of aggr
作者 李可依 愚广灵 陈末 买迪努尔·阿不来孜 胡洋 贾宏涛 Li Keyi;Yu Guangling;Chen Mo;Maidinuer·Abulaizi;Hu Yang;Jia Hongtao(College of Resources and Environment,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;College of Grassland Science,Xinjiang Agricultural University,Urumqi,Xinjiang 830052,China;Xinjiang Key Laboratory of Soil and Plant Ecological Processes,Urumqi,Xinjiang 830052,China)
出处 《水土保持通报》 CSCD 北大核心 2023年第1期332-340,349,共10页 Bulletin of Soil and Water Conservation
基金 国家自然科学基金项目“巴音布鲁克天鹅湖高寒湿地土壤有机碳库及其稳定性研究”(31560171)。
关键词 土地利用方式 新疆 巴音布鲁克高寒草地 土壤团聚体 土壤有机碳 land use pattern Xinjiang Wei Autonomous Region Bayanbluak alpine grassland soil aggregate soil organic carbon
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