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Influence of Biological Soil Crusts on Soil Humus in Rehabilitated Grassland of Hilly Loess Region, China
Authors
刘国彬
张健
许明祥
Publication date
1 January 2010
Publisher
Abstract
本文对黄土丘陵区退耕地生物结皮影响下的土壤腐殖质分异特征进行了研究。结果表明,①该区生物结皮影响下的土壤腐殖质组分HA、FA和HM含量均有明显的分层特征,土层间均表现出:结皮层>0~2cm土层>2~5cm土层;不同年限生物结皮土壤腐殖质含量总体表现出:16年>8年>32年>12年,表明退耕地生物结皮影响下的土壤腐殖质含量随时间变化呈非线性变化趋势;HA/FA平均值变化范围为0.34~0.70,低于1,该区生物结皮影响下的土壤腐殖质胡敏酸含量不高,腐殖酸以富啡酸为主;②结皮层土壤腐殖酸E4/E6值随时间变化总体上呈"抛物线"型变化趋势;而0~2cm和2~5cm土层土壤腐殖酸E4/E6值呈缓慢增长的趋势;③腐殖质组分与土壤养分因子的全N、NO3--N、NH4+-N和有效Zn之间存在极显著的线性相关关系(p<0.01);④土壤腐殖质组分含量的变化与全N、NO3--N、NH4+-N和有效Zn含量间存在满足二项式的函数回归关系(p<0.01),表明生物结皮对土壤C素与N素和有效Zn的影响密切相关
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Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources
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Last time updated on 21/09/2018