Effect of land-use and land-cover change on nutrients in soil in Bashang area, China

来源 :环境科学学报(英文版) | 被引量 : 0次 | 上传用户:george890120
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The Bashang area is a water-source area and ecological barrier zone for Beijing and Tianjin. The area is located at 200 km fromBeijing and Tianjin and is a typical agriculture-pasture-interlacing zone, in which the eco-environment is vulnerable and hence it is sensitive toenvironmental change. The area is relatively lagged in social and economic development, where the traditional cultivation mode is predominatedin agriculture and animal husbandry, but the disturbance by human activity is relatively small. Therefore, in order to reveal the interrelationbetween eco-environmental change in the area and environmental change in Beijing and Tianjin area, it is fairly necessary to study the effect ofland-use and land-cover change on nutrients in soil in this area. According to the actual situation of changed land use for the limited timeperiod, five series of changed land plots were selected and 4 samples were collected from each series for the study. The samples were collectedfrom different soil-forming levels at the same site in different time. Analysis of the collected samples indicates that in the process of change ofland use and land cover, the nutrients in soil, such as organic matter, total N, total P, total K, and available N, P, K, and B, Mo, Mn,Zn, Cu, and Fe, have regularly changed. When the land had changed from grassland and non-irrigated farmland into woodland, and from non-irrigated farmland into irrigated field, the nutrients in soil totally increased. But there exists some exception, i.e. quick-acting N, P, K, andsome microelements have appeared to be inconsistent with the mentioned above regularity in some cases.
其他文献
随着人们对茶叶品质要求的提高和有机茶需求量的大增,昭平县已把大力发展有机茶作为茶叶产业的重点来抓。本文对昭平有机茶生产的优势条件和存在问题进行探讨和分析,并提出了有
为了缓解废弃电器电子产品不规范的回收处理带来的环境影响,中国出台了《废弃电器电子产品回收处理管理条例》及一系列相关政策,促进了废弃电器电子产品资源循环产业的发展.
企业多元化经营和专业化经营是企业制定战略很重要的决策点,往往许多企业盲目的进行战略选择,只看到一时的利益,而没有考虑企业长远的发展规划。文章通过对企业专业化经营与多元
在高速逻辑设计中,需要考虑避免出现振铃、串扰等传输线现象。就此详细讨论了在Ultra2SCSI单端和差分两种模式兼容下,其PCB的输出阻抗与连接电缆的两种阻抗的匹配问题,并介绍了
当前,国内经济形势呈现“新常态”经济态势。从当前我国经济发展的阶段性特征出发,适应新常态,保持战略上的平常心态对于应对激烈的市场竞争具有积极的作用。作者结合国内能源、
福特腾飞的奥秘--“一季一查”制度rn1960年11月,艾柯卡升任福特公司副总裁和福特部的总经理.为了加强管理、提高工作效率,他决定在公司推行“一季一查”的管理制度.
女孩在家门口踱来踱去,连敲门的勇气也没有了.rn落日收起它最后的一丝余晖,繁星早已迫不及待地铺满夜空,撒下点点星光.rn白天的悲伤重新爬上女孩的心头——rn女孩科学考砸了!
针对具有高效絮凝性能的有机高分子絮凝剂存在易吸潮、难溶解的不足,设计了一种高分子有机絮凝剂的溶解输送装置,该装置简单实用,易于在污水处理生产中推广应用.将该溶解装置
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生、测量监控等方面人手,介绍了S226海滨大桥
期刊