干旱区生态环境知识资源中心(Arid): 岷江上游花椒地/林地边界土壤水分影响域的定量判定

Arid

	岷江上游花椒地/林地边界土壤水分影响域的定量判定
其他题名	Quantitative determination of the depth of edge influence on soil moisture in pepper-forest boundary of Minjiang River upper reaches
	李丽光; 何兴元; 李秀珍; 问青春
ISSN	1001-9332
出版年	2006
卷号	17 期号:11 页码:2011-2015
中文摘要	在岷江上游干旱河谷区,选取典型的花椒地/林地边界,利用TDR仪测定干旱条件下、雨后和每月0～15 cm土层水分含量,并用移动窗口法判定土壤水分的边界影响域.结果表明,若用移动窗口法对土壤水分的边界影响域进行判定,当窗口宽度为8～12时,边界影响域较易判定.年内土壤水分随时间变化而变化.这种变化可分为土壤水分上升期、高峰期和消退期3个时期.干旱条件下土壤水分的边界影响域较小,其宽度约从花椒地6 m到林地2 m;雨后土壤水分的边界影响域有较大增加,其宽度约从花椒地12 m到林地2 m;年内土壤水分的边界影响域宽度约从花椒地10 m到林地2 m之间变化.不同季节土壤水分的边界影响域不同,并随着季节的变化呈动态变化.从生态学意义上讲,岷江上游地区目前进行的将花椒地退耕成林地、栽植树苗的措施是不可取的,该区退耕还林的最好方法应该是退耕,使其灌木林或草本植物自然生长.
英文摘要	A typical pepptT-foresl boundary was selected in IIIK arid valley of Minjiang River upper reaches, and the moisture content in 0-15 cm soil kycr was determined by lime-domain refleclometry (TDR) during drought, after rain, and different seasons. Moving split-window techniques (MSWT) was employed to delect the depth ol edge influence (DEI) on soil moisture and its dynamic variation with Unit;. The results showed that the changes of squared Euclidean distance (SKI)) curve on the graph tended to become stable when the window width reached 8～12, and DEI could be detected. The seasonal vanution of soil moisture could be divided into three periods, i. e., rising period (January to April), peak period (May to October), and lessen period (November to December). DEI was smaller during drought, and increased after rain. The DEI on soil moisture ranged from 6 m in pepper field to 2 m in forest during drought and from 12 m in pepper field to 2 m in forest after rain, but ranged from 10 m in pepper field to 2 m in forest field within a year. DEI was different in different seasons, and was dynamic. Under such condition of soil moisture, the forest restoration from pepper land and ihe seedling planting were not ecologically reasonable. Reducing human disturbance and revegetating with natural shrubs and meadows could be more effective for vegetation conservation in the arid valley of Minjiang River upper reaches.
中文关键词	边界 ; 移动窗口法 ; 土壤水分 ; 边界影响域
英文关键词	Boundary Moving split-window technique Soil moisture Depth of edge influence (DEI)
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:2610067
来源机构	中国科学院沈阳应用生态研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/220347
作者单位	中国科学院沈阳应用生态研究所, 沈阳, 辽宁 110016, 中国
推荐引用方式 GB/T 7714	李丽光,何兴元,李秀珍,等. 岷江上游花椒地/林地边界土壤水分影响域的定量判定[J]. 中国科学院沈阳应用生态研究所,2006,17(11):2011-2015.
APA	李丽光,何兴元,李秀珍,&问青春.(2006).岷江上游花椒地/林地边界土壤水分影响域的定量判定.,17(11),2011-2015.
MLA	李丽光,et al."岷江上游花椒地/林地边界土壤水分影响域的定量判定".17.11(2006):2011-2015.