%0 Journal Article
%T Relationship between intensive utilization and environmental pressure of cultivatedland: a case study on 780 cropland parcels in Tarim River Basin<br>基于地块尺度的耕地集约利用与环境压力关系—— 以塔里木河流域780 个地块为例
%A ZHANG Xin-Huan
%A YANG De-Gang
%A WANG Chang-Yan
%A HOU Yan-Jun
%A <br>张新焕
%A 杨德刚
%A 王昌燕
%A 侯艳军
%J 中国生态农业学报
%D 2012
%I 
%X Intensive degree (ID) is a common index used to judge the effectiveness of land utilization. With increasing ID, cultivated lands generate certain environmental pressures from extensive use of agro-chemicals like fertilizers and pesticides, and mulching, etc. This paper analyzed the intensity of utilization and environmental pressure of 780 cropland parcels in the Tarim River Basin (TRB) using data acquired from household questionnaire survey. The aim of the study was to explore environmental pressures generated by highly intensive utilization of cultivated lands. The results showed that intensive utilization of cultivated lands caused some degrees of environmental pressure in TRB study area. Environmental load ratio (ELR) of investigated cultivated lands revealed changing trends with increasing IDs of cropland parcels. In 75.90% of the cropland parcels with ID < 1.0 Yuan·m?2, ELR increased with increasing ID. ELR change in 18.60% of cropland parcels with ID in the range of 1~1.5 Yuan·m?2 showed a stable trend relative to increasing ID. Only in 5.50% of cropland parcels with ID > 1.5 Yuan·m?2 did LER decrease with increasing ID. Differences in input structures in cultivated lands were the main driver of the variations in ELR. Rise in the proportion of non-renewable emergy input resulted in increasing ELR. However, with the increasing non-renewable emergy input, ELR rise was restrained by enhanced renewable emergy input. To a certain degree, differences in the trends of cropland parcel ELR suggested that in the study area, the utilization of most cropland parcels was primarily intensive. However, some cropland parcels had been transformed into advanced use intensity. Environmental pressure of cultivated lands was related to crop type and cropland parcel size. For cropland parcels under wheat and fruits, ELR at any scale parcel increased with increasing ID. For cotton fields, small-scale parcel ELR increased with increasing ID. It, however, showed no obvious ELR change for large-scale cotton fields (>0.33 hm2). For cucurbits fields, LER was stable due to low and stable ID driven by the predominantly small-scale cropland parcels. However, LER increased with increasing ID once parcel size exceeded 0.33 hm2. It suggested that alleviation measures of environmental pressure of cultivated lands should be on the basis for crop type and cropland area.
%K Questionnaire survey
%K Intensive cropland utilization
%K Intensive degree
%K Environmental pressure
%K Environmentalload ratio
%K Cropland parcel
%K Tarim River Basin<br>问卷调查
%K 耕地集约利用
%K 集约度
%K 环境压力
%K 环境负荷率
%K 耕地地块
%K 塔里木河流域
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=03F54A49DE00578AA0E5DDF5BC021AA7&cid=1A8B5357F0EF07B8&jid=AB3ABF502E2E1FF39F0E3B80164C9031&aid=7B98DB109FC4159935E33E0A0AB068A5&yid=99E9153A83D4CB11&vid=A04140E723CB732E&iid=94C357A881DFC066&sid=20C9FB8C7B4A22AD&eid=D33D61F62E4C72A7&journal_id=1671-3990&journal_name=中国生态农业学报&referenced_num=0&reference_num=0