Studies of Soil Physical Properties and Community Characteristics of Different Abandoned Lands in the Minqin Oasis,Downstream of the Shiyang River  

石羊河下游民勤绿洲不同年限退耕地土壤物理性质与群落特征（英文）

作　　者：郭春秀[1] 何芳兰[1] 马剑平[1] 安富博[1] 马俊梅[1] 袁宏波[1] 赵鹏[1] 刘克彪[1] 申国峰 

机构地区：[1]甘肃省荒漠化与风沙灾害防治重点实验室-省部共建国家重点实验室培育基地&甘肃省治沙研究所,甘肃武威733000 [2]合肥市圆鼎土地规划设计有限公司,安徽合肥230031

出　　处：《Agricultural Science & Technology》2016年第7期1697-1701,共5页农业科学与技术（英文版）

基　　金：Supported by National Natural Science Foundation of China(31560128,31360203,31260201,31460223,31460134)

摘　　要：[Objective] The aim was to explore physical properties and community characteristics of abandoned lands in different years in Minqin Oasis, downstream of the Shiyang River, [Method] The evolution of environment and plant community characteristics in different abandoned lands were analyzed after abandonment for 1, 2, 3, 4, 5, 8, 15, 24 and 31 years, and the plant community characteristics, water content, bulk density, porosity and mechanical composition of soil in the different a- bandoned lands were also researched in the Minqin Oasis, downstream of the Shiyang River. [Result] Plant of 32 species spread over 14 family live through fifty years appeared in abandoned lands in the study area. Shrubs was 6 species, herbs was 26 species among them, which were 18.75%, 81.25% respectively. The goose- foot family （6 species）, the composite family（4 species）,the grass family（4 species）, caltrop family（3 species） were 53.13% among them. Within the range of 0-40 cm of different abandoned Land, the soil moisture content showed a trend of first increase and then decrease with the increase of soil depth changes in soil bulk density and porosity of less obvious. In the range of 0-40 cm soil depth, the largest proportion of fine sand, followed by silt and clay and the smallest proportion of coarse sand in every plot, but the proportion of the each silt size varies little with the years aban- doned. [Conclusion] The research provides references for vegetation reconstruction and eco-environment construction in abandoned lands in downstream of Shiyang River.[目的]研究石羊河下游民勤绿洲不同年限退耕地土壤物理性质与群落特征。[方法]通过对石羊河下游民勤绿洲1a、2a、3a、4a、5a、8a、15a、24a和31a退耕地的生境和植被群落特征的分析,研究了不同年限退耕地植被群落、土壤水份、容重、孔隙度和机械组成的变化。[结果]1石羊河下游民勤绿洲退耕地在31a自然恢复过程中共出现植物32种,14科,其中灌木6种,草本26种,分别占总物种数的81.25%、18.75%;藜科（6种）、菊科（4种）,禾本科（4种）、蒺藜科（3种）,4科植物占总物种数的53.13%;2不同年限退耕地0~40 cm范围内土壤含水量随土层深度增加经历了先增后减的一个变化过程,土壤容重及孔隙度变化不太明显;3在退耕地0~40 cm土层范围内,各样地细砂粒的比例最大,粉粒和粘粒次之,粗砂粒的比例最小,但各粒径所占比例随退耕年限的变化不大。[结论]该研究可为石羊河下游退耕地区植被重建及生态环境建设提供借鉴。

关 键 词：Minqin Oasis Abandoned land Years abandoned Soil physical proper- ties Vegetation characteristics 

分 类 号：S152[农业科学—土壤学] Q948[农业科学—农业基础科学]