摘要
通过整合分析方法,对中国干旱、半干旱区农田、林地、灌丛和草地4种土地利用方式下地表土壤有机碳、氮含量进行了定量分析。结果表明,不同土地利用方式对表土碳、氮含量影响显著;草地转化为农田将降低土壤有机碳、全氮含量(-60.9%和-54.3%),草地转化为林地将导致土壤有机碳、全氮含量的降低(-21.5%和-31.3%);草地转化为灌木林地将增加土壤有机碳含量(+33.6%)和降低土壤全氮含量(-5.9%)。可见,受人类活动干扰最为强烈的农田的土壤有机碳、全氮含量最低,而草地、灌木林地具有较好的土壤肥力和土壤质量保持功能。因此,开展灌草植被恢复和农田弃耕(自然恢复)可有效改善土壤肥力和增加土壤碳、氮存贮。
Through integrating analytical method,quantitative analysis was carried out for soil organic carbon and nitrogen content based on four land use ways,namely cropland,forestland,shrubland and grassland.The results indicated that different land use types have significant effects on soil C and N storage;soil C and N decline after land use changes from grassland to cropland（-60.9% and-54.3%）,grassland to forest（-21.5% and-31.3%）.Grassland changed into shrubland causes an increase of soil C stocks（＋33.6%） and a decrease of soil N（-5.9%）.It is thus clear that soil N content of cropland which obstructed by human activities strongly is lowest,however,grassland and shrubland had better soil fertility and soil quality holding function.Thus,carrying out vegetation recovery of grassland and farmland to abandon（spontaneous recovery） can improve soil fertility and soil storage effectively.
出处
《安徽农业科学》
CAS
北大核心
2011年第14期8408-8411,8419,共5页
Journal of Anhui Agricultural Sciences
基金
国家自然科学基金项目(40801038
40721061)
中国博士后科学基金项目(20080430790)
