摘要
以四川宁南县金沙江下游的河谷地带为研究区域,选择相同海拔下7种主要的土地利用方式为研究对象,通过室内测试分析,并运用统计和相关分析等方法,研究不同土地利用方式下的土壤可蚀性变异特征。结果表明:在干热河谷区,天然植被水桐树林破坏改为其它土地利用方式后,土壤有机质、全氮、全磷和碱解氮含量显著降低,速效磷和容重没有显著变化,速效钾有一定程度升高,不同利用方式对其影响作用不同,但总体来说改造为合欢林和撂荒草地对土壤理化属性的影响相对较少。相对于天然水桐林,其它土地利用方式土壤可蚀性明显增加,其大小依次为:花椒地<撂荒地<草地<新银合欢地<桑地<甘蔗地。相比较而言,无论是天然林地还是人工经济林地,其土壤可蚀性都处于较低的水平;受人为活动影响强烈的农业用地,其土壤可蚀性水平一般较高。说明该地区农业耕作措施可导致土壤对侵蚀营力分离和搬运作用敏感性增强,抗蚀性能较低,更加容易遭受侵蚀,因此在金沙江干热河谷区,从水土保持角度出发,应该尽可能地减少人为活动对土地的干扰,提高土地抵抗侵蚀的能力。
Based on field sampling and indoor determination,together with statistical analysis,soil erodobility of 7 land utilization types in dry-hot valley in Jinsha River was studied.Results indicated that in dry-hot valley,after the forest land of Camptotheca acuminate was changed to other land types,content of soil organic matter（SOM）,total nitrogen（TN）,total phosphorus（TP） and available nitrogen（AN） in soil on the other lands decreased obviously,available phosphorus（AP） and soil bulk density changed little,while available potassium increased a little.Generally,the impact on soil physic-chemical properties was relatively small after transforming to leucocephala land and abandoned grassland.Compared to the forest land of Camptotheca acuminate,soil erodibility on the other land types increased obviously,which was followed in the order：pepper land abandoned land grass land Leucaena land mulberry land sugarcane land.Comparatively,soil erodobility on both natural and economic forest land was smaller,while it was bigger on agricultural land.It can be inferred that irrational agricultural activities readily lead to the rise of soil erodibility.Thus in this area,from the point of soil and water conservation,it was important to reduce agricultural activities as much as possible.
出处
《水土保持研究》
CSCD
北大核心
2011年第4期16-19,共4页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(41071182
40971161)
陕西省自然科学基金重点项目(2009JZ008
SJ08-ZD02)
