干旱区生态环境知识资源中心(Arid): 在模拟降水和践踏处理复合作用下长芒草典型草原土壤可蚀性研究

Arid

	在模拟降水和践踏处理复合作用下长芒草典型草原土壤可蚀性研究
其他题名	A study on soil erodibility in a combined experimental trampling and simulated rainfall experiment on a Stipa bungeana steppe in Huanxian County, Gansu Province, China
	林慧龙; 王苗苗; 李学玲; 王钊齐
来源期刊	草业学报
ISSN	1004-5759
出版年	2010
卷号	19 期号:3 页码:76-87
中文摘要	模拟降水和试验践踏通过各种不同强度的组合方式改变土壤抗蚀性, 从而起到对草地土壤侵蚀的增减作用。在同一模拟降水量条件下, 随着践踏强度的逐渐加大, 土壤可蚀性 K 值依次增大, 表明践踏增大了放牧侵蚀的风险；但 K 值的增幅显然与模拟降水量相关, 践踏强度由轻度递增到重度, K 值的增幅在干旱、自然降水、平水、丰水条件下依次为干旱>自然降水>平水和丰水, 表明模拟降水和践踏对 K 值的影响存在交互效应, 模拟降水具有减缓 K 值随践踏强度增大的趋势。从简单相关关系来看, K 值与践踏强度呈极显著正相关(相关系数0.741), 与降水呈负相关(相关系数-0.378), 但 K 值并不是可以由践踏强度和模拟降水量二元线性回归可以解说地。与传统回归模型相比较, BP网络模型能更好地刻画土壤可蚀性 K 值的复杂非线性特性, 具有自学习、自组织、自适应和容错性等一系列优点, 因而,以牧草生长期单位面积累计践踏量和模拟降水量为自变量的土壤可蚀性 K 值的ANN (artificial neural net works) 关系模型具有较好的拟合结果和预测能力,说明直接从输入到草地生态系统的外侵蚀营力着手,跨越系统内土壤可蚀性变化的内在的复杂的隐含过程建立的输出端土壤可蚀性 K 值与土壤侵蚀外营力的ANN 关系模型, 是准确确定土壤可蚀性 K 值的一次成功尝试。
英文摘要	Soil erodibility differed with various combinations of experimental trampling and simulated rainfall. Under the same simulated rainfall condition, the soil erodibility factor, k, increased as the trampling intensity increased, suggesting that trampling enhanced grazing-induced erosion risk. However, the amplitude of the k value was apparently related to the levels of simulated rainfall: the k value changed in the sequence arid〉 natural〉 average〉 high. There was an interaction between the effects of trampling and simulated rainfall on the k value. Simulated rainfall reduced the trend of k value increase while an increase in trampling intensity did the opposite. A positive correlation was found between the k value and trampling intensity (Coefficient=0.741), and a negative correlation between k value and rainfall level (Coefficient=-0.378). Compared with traditional regression models, the artificial neutral network (ANN) model shows many advantages, such as self-studying, self-orga nizing, s elf-adapting and fault tolerance. Therefore k was calculated using the ANN model, based on the independent variables of accumulated trampling effects per unit area and simulated rainfall. The ANN model allows the complicated soil erodibility mechanisms to be skipped and to directly establish the relationship between soil erodibility and factors influencing it. e.g. trampling and rainfall. This study is an innovative attempt to evaluate soil erodibility more precisely.
中文关键词	试验践踏 ; 践踏强度 ; 模拟降水 ; 土壤可蚀性 ; ANN模型
英文关键词	experimental trampling trampling intensity artificial simulated rainfall soil erodibility artificial neutral network (ANN) model
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:3901789
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224757
作者单位	兰州大学草地农业科技学院甘肃草原生态研究所, 兰州, 甘肃 730020, 中国
推荐引用方式 GB/T 7714	林慧龙,王苗苗,李学玲,等. 在模拟降水和践踏处理复合作用下长芒草典型草原土壤可蚀性研究[J]. 兰州大学,2010,19(3):76-87.
APA	林慧龙,王苗苗,李学玲,&王钊齐.(2010).在模拟降水和践踏处理复合作用下长芒草典型草原土壤可蚀性研究.草业学报,19(3),76-87.
MLA	林慧龙,et al."在模拟降水和践踏处理复合作用下长芒草典型草原土壤可蚀性研究".草业学报 19.3(2010):76-87.