黄土高原丘陵沟壑区新造耕地质量评价(英文)

来源 :Journal of Geographical Sciences | 被引量 : 0次 | 上传用户:liyanliang163
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
In order to better understand the quality of newly created farmland(NF) as well as slope and check-dam farmland(CF) soil quality, two typical traditional farmland areas within the hilly and gully region of Chinese Loess Plateau were selected as controls in this analysis.The results of this study initially reveal that pH values for slope farmland(SF) and CF were significantly lower(P < 0.05) than those for NF and that SF values were always greater than those of their CF counterparts. At the same time, cation exchange capacity(CEC) and soil organic matter(SOM) occurred in the following size-decreasing sequence, i.e., CF, SF, and NF. Data also show that long-term planting has resulted in increases in total nitrogen(N),available N, total phosphorus(P), available P, total potassium(K) and available K and has also enhanced concentrations of soil copper(Cu), zinc(Zn), iron(Fe), and manganese(Mg)as well as soil cadmium(Ca), lead(Pb), chromium(Cr), and mercury(Hg). These latter elements occur in the concentration sequence of SF > CF > NF. Overall, results indicate that long-term planting negatively impacts soil health because of the accumulation of toxic heavy metals. This means that farmland planted over longer timescales needs to lie fallow to enable it to rehabilitate while NF requires the addition of organic matter as well as rotational utilization in order to facilitate the development of green agriculture.
其他文献
随着社会经济的不断发展,建筑物的建设工作逐渐向大型化和高层化转化,这就需要进行电梯安装工作.同时,在安装电梯的过程中也需要结合实际状况进行有效的设计,但是在实际安装
为推进农业机械化和农机装备产业转型升级,推动解决优势特色农产品生产"无机可用""无好机用"问题,农业农村部农业机械化技术开发推广总站组织开展全国优势特色农产品机械化生
本文以某化工厂的多台加热炉项目控制系统为例,构建了以太网通信系统,集中多台西门子PLC以及DCS通信,借助协议科学化汇总PLC和DCS通信数据内容,以实现多台西门子PLC以及DCS通
针对常见的非球面面形测量问题,本文提出了一种新的非球面面形测量操作方法,并将此方法运用于生产加工过程,取得了很好的实践效果。本方法解决了直接面形轮廓法测量非球面的
<正>本报告以深入的情报跟踪与分析为基础,围绕复杂系统总体设计、虚拟设计与仿真验证、设计/制造集成与协同、数字化车间系统等数字化设计制造及生产管理技术,增材制造、高
对奶牛的图像进行高精度边缘特征提取,为奶牛的个体识别或者奶牛的线性评定提供重要的评判依据,可以更好的实现奶牛保险业的自动化管理。采用基于FCN和VGG改进的边缘检测HED(Holistically-Nested Edge Detection)网络,在caffe框架下通过MATLAB实现对奶牛原始图像的边缘特征提取。将HED网络检测出的边缘特征图像与传统优化过的Canny算子作比较,无论从直观的边缘
<正>近日,第十四届北京国际汽车展览会在中国国际展览中心盛大开幕。北汽集团无人驾驶汽车成为焦点,中国兵器工业集团东北工业集团奥威公司提供的线控制动系统作为无人驾驶至
结合广西某水库工程实例,通过对水库大坝坝体、坝基进行钻探、取样与试验,进行室内土体物理力学性质试验及现场安全检查,并采用二维渗流有限元计算方法、简化Bishop法及瑞典
新时代的步伐正处于不断地向前迈进当中,各种新科技伴随时代的进步争相涌现,网络的出现改变了人们日常的生产生活,越来越多的疾病控制、工程建设及军事指挥等覆盖了指挥自动
针对高秆、密植作物的病虫害防治,喷雾雾滴穿透性差,防治效率低的问题,将无人机远程控制技术、烟雾载药技术与低量喷雾技术进行融合,设计一种高效的无人植保喷烟机以及远程喷