荒草地小区土壤侵蚀的~7Be示踪研究  

USING ~7Be TO DOCUMENT SOIL EROSION ON THE WEED PLOTS

作　　者：张博[1,2] 张风宝[1,3] 杨明义[1,3] 

机构地区：[1]中国科学院水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [2]中国科学院大学,北京100049 [3]西北农林科技大学水土保持研究所,陕西杨凌712100

出　　处：《核农学报》2013年第1期93-98,共6页Journal of Nuclear Agricultural Sciences

基　　金：国家自然科学基金(40901127;41171228);陕西省自然科学基础研究计划(S2012JC6612);西北农林科技大学基本科研业务费专项(QN2011072)

摘　　要：通过裸露地小区和荒草地小区7Be示踪对比研究,发现坡面植被覆盖对利用7Be示踪估算坡面土壤侵蚀速率有较大影响。在Walling等提出的7Be示踪估算裸露坡面土壤侵蚀速率模型中引入植被因子,估算有植被覆盖坡面的土壤侵蚀速率,结果显示修正后模型计算值与小区实测值比较接近,说明增加植被因子后的模型能够很好估算有植被覆盖坡面的土壤侵蚀速率,有关结果可为深入研究植被覆盖与土壤侵蚀之间的响应关系提供有效手段。Be tracing technology was applied to document soil erosion on the bare plot and weed plot,and compae soil erosion rate with the calculated rate.Results indicated that vegetation cover had obvious effect on the estimate of soil erosion rate on the weed plot using 7Be measurement.Therefore,a factor of vegetation had been introduced into the Walling＇s model of converting 7Be activity to soil erosion rate for estimating soil erosion rate on the weed slope surface.It was found that the soil erosion rates calculated by modified model were well close to the measured values on the weed plot,which illustrated that the modified model could be well used to estimate the rates of soil loss on the weed slope surface.These findings provide effective means for further study on the relationship between vegetation cover and soil erosion.

关 键 词：小区 7Be示踪 荒草地 土壤侵蚀 

分 类 号：S157[农业科学—土壤学]