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soil bareness
相关语句
  土壤裸露
     RELATIONSHIP BETWEEN SOIL BARENESS AND LANDSCAPE PATTERN IN THE LOESS PLATEAU: A CASE STUDIES ON THE TOWER REGION OF THE YAN'AN CITY
     黄土高原土壤裸露与景观格局关系——以延安市宝塔区为例
短句来源
     Landscape fragmentation and soil bareness study in north Shaanbei Loess Plateau
     陕北黄土高原景观破碎化及其土壤裸露效应
短句来源
  相似匹配句对
     soil fertility;
     土壤肥力;
短句来源
     ⑥soil.
     ⑥土壤因素。
短句来源
     Landscape fragmentation and soil bareness study in north Shaanbei Loess Plateau
     陕北黄土高原景观破碎化及其土壤裸露效应
短句来源
     the ranges of spatial variability of soil moisture for bareness and farmland are 3.17m and 7.25m respectively.
     裸地和农田土壤水分空间变异范围分别为 3.1 7m和 7.2 5m。
短句来源
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Soil bareness is sort soil erosion leading to a stronger soil erosion. There is complicated relationship between soil and landscape pattern resulted from human activities and geological processes. The Tower region of the Yan'an City in the Loess Plateau is used as typical area for the studies of soil bareness, types and structure of landscape. According to the differential landscape pattern in an individual watershed, it is classified into agriculture and pasture area; agriculture, pasture and forestry...

Soil bareness is sort soil erosion leading to a stronger soil erosion. There is complicated relationship between soil and landscape pattern resulted from human activities and geological processes. The Tower region of the Yan'an City in the Loess Plateau is used as typical area for the studies of soil bareness, types and structure of landscape. According to the differential landscape pattern in an individual watershed, it is classified into agriculture and pasture area; agriculture, pasture and forestry area; agriculture and forestry area; and forestry and pasture area. The degree of soil bareness is analysed based on each of landscape type and distinguished as urban and town landscape; dry farming landscape; lawn landscape and forestry lands cape.It is not numerically proportional between the degree of soil bareness in the watersheds and landscape types. The soil bareness is closely related to the landscape structure, spatial distribution and diversity characteristics. The analysis of drainage system in the area can illustrate the relationship between the degree of soil bareness and landscape patterns. The values of soil bareness in Xigou and Fengfuchuan are higher than those in other drainage areas, which require systematical drainage management and environmental protection. Human activities are closely related to the soil bareness in those areas such as built-up area, residential area, and hilly area.In the Tower region of Yan'an City, the proportional distribution of agricultural, pasture, and forestry areas could be used in a micro-scale to explain the degree of soil bareness. Generally more the landscape types have, worse the soil bareness.In conclusion, the relationship between soil bareness and landscape types is complicated in the Loess Plateau. Soil bareness is process of soil erosion and the seriousness of soil bareness might be represented by the amounts of landscape pattern, which is also related to human activity and environmental conditions.

土壤裸露是水土流失具体的空间表现,同时又是导致进一步水土流失的重要因素。由人类和自然相互作用下形成的景观格局对土壤裸露具有深刻的影响。为深入探讨二者间的内部联系,文章选定位于黄土高原的延安市宝塔区为研究区,分别就景观格局的类型组成和空间结构,分析其与土壤裸露的关系。研究结果可知人为活动强度较大的区域土壤裸露程度较高,在景观类型上,表现出滩地、农村居民点、其他建设用地、低覆盖度草地及山区旱地等景观类型的土壤裸露值较高,另外,从景观组成来看,农牧组成为主的流域土壤裸露值明显高于其他流域;通过景观空间结构与土壤裸露的关系分析,可知个体单元型态、空间构型以及整体多样性等景观空间结构特征,均对土壤裸露程度具有不同大小的指示意义,其中又以景观聚集度及平均斑块面积与土壤裸露程度有强烈负相关。

The study of landscape fragmentation is an important means to reveal regional ecological processes. Using remote sensing data of 1987, 1997, and 2002, some representative quantitative indices of the landscape spatial structure and landscape fragmentation were calculated to investigate the relationship between landscape ecological structure and landscape pattern in Shaanbei Loess Plateau using FRAGSTATS. Through the analysis of the types of fragmented landscape, we found that the main contribution to regional...

The study of landscape fragmentation is an important means to reveal regional ecological processes. Using remote sensing data of 1987, 1997, and 2002, some representative quantitative indices of the landscape spatial structure and landscape fragmentation were calculated to investigate the relationship between landscape ecological structure and landscape pattern in Shaanbei Loess Plateau using FRAGSTATS. Through the analysis of the types of fragmented landscape, we found that the main contribution to regional landscape fragmentation came from cropland and grassland. Furthermore, with the increasing of percentage of grassland, landscape became more fragmented, but forestland coverage has inverse effects on the fragmentation. Based upon the well-defined characteristics of this region's evolving landscape fragmentation, the relationship of landscape fragmentation and spatial pattern was investigated. More fragmented landscape is always with less patch area variation, more dispersed spatial configuration and complicated patch shape. In conclusion,landscape fragmentation has high sensitivity with percentage of similarity adjacencies, aggregation index,edge density, interspersion and juxtaposition index. The relationship and feedback between landscape pattern, function and process serve to describe the behavior of a regional landscape. Based on landscape function characteristics such as biological productivity, soil nutrient content, soil bareness, etc, a quantitative method and digital model for evaluating soil bareness in study area were devised. To get large-area images accurately and promptly is very important for monitoring of ecological process in regional scale. Moderate-Resolution Imaging Spectroradiometer (MODIS) images were used to derive soil bareness information calculated with Linear Spectral Unmixing (LSU) based on Mixture Spectral Analysis (MSA). As a result, the extent of fragmentation contributed mostly to the soil bareness in cropland, grassland and forestland, but lack of obvious relationship with unused land type. In details, the value of soil bareness in highly-fragmentized type altered from 100 to 150, medium-fragmentized type changed from 100 to 140, and low-fragmentized centralized from 100 to 110. Through the correlation analysis on landscape fragmentation and soil bareness, it was found that patch density and landscape configuration had a linear relationship with soil bareness for the decision coefficient between them was above 0.5. Patch area variation and patch shape had no direct relationship with soil bareness for decision coefficient was under 0.1.

破碎化是黄土高原典型的景观特征 ,深刻影响着区域的景观格局与功能。为深入探讨黄土高原景观破碎化的格局特征及其生态效应 ,选择陕北黄土高原为研究区 ,结合景观格局指数与主成分分析对破碎化程度进行量化 ,并针对研究区相应的景观格局特征、造成破碎化的景观类型及土壤裸露程度 ,进行组成、分布及动态分析。研究结果发现陕北黄土高原景观格局中的斑块密度特征对破碎化有较强的指示意义 ,其次则是景观的空间构型特征。草地和农地等与人为活动关系较为密切的景观类型是造成研究区景观破碎化的主要原因 ,且高破碎化区域的土壤裸露值明显高于低破碎化区域

Winter cover crop(WCC)have some availability to agricultural ecosystems,which decreasing winter soil bareness,increasing soil organic carbon sink and controlling nitrate leaching.There are some good conditions to WCC biomass carbon fixation in the rice planting areas of South China.This paper chose WCC:ryegrass,milkvech,rape and rice rotation in the rice planting areas of South China.The results show ryegrass has high carbon sequestration potential from aboveground biomass,and its carbon fixation...

Winter cover crop(WCC)have some availability to agricultural ecosystems,which decreasing winter soil bareness,increasing soil organic carbon sink and controlling nitrate leaching.There are some good conditions to WCC biomass carbon fixation in the rice planting areas of South China.This paper chose WCC:ryegrass,milkvech,rape and rice rotation in the rice planting areas of South China.The results show ryegrass has high carbon sequestration potential from aboveground biomass,and its carbon fixation is 4 044.9 kg·hm-2 and that of belowground 1 533.7 kg·hm-2.Aboveground and belowground carbon fixation from Milkvech is 1 799.6 kg·hm-2 and 1 023.8 kg·hm-2,and that from rape is 1 023.8 kg·hm-2 and 339.0 kg·hm-2,respectively.Carbon fixation in every cover crop treatment is higher than that of winter fallow cropland.The capacity of ryegrass roots' carbon fixation can improve the effects of cropland soil carbon sink.The roots and crowns during WCC growing is the key to enhance carbon fixation in rice field ecosystem in China.The rice yields haven't been influenced notably in different cover crop treatments.

冬季覆盖作物为在冬闲季节以减少土壤裸露、增加生物产量、抑制硝态氮淋溶等为目的而种植的作物。南方水稻种植区地处热带、亚热带湿润地区有利于冬闲覆盖作物生产。冬季覆盖作物在增加生物产量的同时,可以增加稻田生态系统碳蓄积效应。本研究在南方水稻种植区选择冬闲季覆盖作物黑麦草、紫云英、油菜,以冬闲田为照进行生产比较试验,考察不同覆盖作物碳蓄积能力及对后茬作物产量的影响。结果表明,黑麦草地上部碳蓄积为4044.9kg·hm-2,地下部碳蓄积为1533.7kg·hm-2,紫云英地上部、地下部碳蓄积分别为1799.6kg·hm-2,1023.8kg·hm-2,油菜的分别为1023.8kg·hm-2,339.0kg·hm-2;黑麦草的碳蓄积量显著高于紫云英和油菜,各覆盖作物处理碳蓄积量均显著高于冬闲田。黑麦草地下根系表现强大的碳蓄积能力,可以提高土壤碳汇效应。不同覆盖作物-双季稻稻田生态系统,冬季覆盖作物残茬短期内对主作物的产量因素均没有显著的影响。

 
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