Effect of Land Use and Land Cover Change on the Changes in Net Primary Productivity in Karst Areas of Southwest China: A Case Study of Huanjiang Maonan Autonomous County     

ZHANG Mengyu  ZHANG Li  REN Xiaoli  HE Honglin  LV Yan  WANG Junbang  YAN Huimin 《资源与生态学报(英文版)》2020,11(6):606-616

Karst areas in southwest China have experienced significant land cover and land use change (LUCC) due to utilization for human activity and a comprehensive rocky desertification control project (RDCP) since 2008. It is important to quantify the effect of LUCC on ecosystem productivity in this region for assessing the overall benefit of this ecological restoration project. In this study, we used using MODIS land cover and NPP products to investigate the relative contribution of LUCC to the change in net primary productivity (NPP) during 2008-2013 in Huanjiang County, one of first one hundred pilot counties to implement RDCP. Our results show that NPP increased in 95.53% of the county, and the average growth of NPP in non-rocky desertification area was higher than in rocky desertification or potential rocky desertification areas. LUCC has an important contribution (25.23%) to the NPP increase in the county, especially in the LUCC area (70.97%), which increased the average NPP by 3.9% and 10.5%, respectively. Across the six RDCP regions in the county, the average increase in NPP for the vegetation restoration measure of governed karst area is significantly greater than in the ungoverned karst area, and the positive change in NPP increased with the increasing implementation area of the vegetation restoration measure.  相似文献   

东海9614孔沉积物特征及环境     

高素兰  王慧艳 《海岸工程》1998,17(3):6-13

根据1996年"中－法合作东海计划",在东海大陆架打钻一口,取一长196cm的岩芯。对该岩芯样品粒度分析结果和现场生物种属记录综合研究,表明此岩芯属浅海沉积,既有波浪多次往返搬运沉积的特点,又有河流砂沉积的特点。以74cm为界,上层为冰后期海进滨海相沉积,下层为晚更新世末冰期海退海相沉积。  相似文献   

遥感技术在探查杨庄矿朱庄矿奥灰水中的应用   总被引：1，自引：0，他引：1  

朱第植 《煤田地质与勘探》1998,26(4):49-52

应用遥感技术查明了杨庄矿和朱庄矿奥灰水的径流条件,所圈定的补给地带,经钻探得到了验证。   相似文献   

山西柳林泉域地下水化学信息的因子—克立格分析   总被引：2，自引：0，他引：2  

马腾  王焰新 《水文地质工程地质》1999,26(1):44-46

本文尝试将因子分析与克立格法相结合,用以分析柳林泉域地下水化学资料,获取到地下水成因,循环深度等方面的信息。研究表明,因子－克立格法是一种有效,实用的研究区域水文地质问题的分析方法。  相似文献   

Geomorphic aspects of groundwater flow   总被引：3，自引：0，他引：3  

Robert G. LaFleur 《Hydrogeology Journal》1999,7(1):78-93

 The many roles that groundwater plays in landscape evolution are becoming more widely appreciated. In this overview, three major categories of groundwater processes and resulting landforms are considered: (1) Dissolution creates various karst geometries, mainly in carbonate rocks, in response to conditions of recharge, geologic setting, lithology, and groundwater circulation. Denudation and cave formation rates can be estimated from kinetic and hydraulic parameters. (2) Groundwater weathering generates regoliths of residual alteration products at weathering fronts, and subsequent exhumation exposes corestones, flared slopes, balanced rocks, domed inselbergs, and etchplains of regional importance. Groundwater relocation of dissolved salts creates duricrusts of various compositions, which become landforms. (3) Soil and rock erosion by groundwater processes include piping, seepage erosion, and sapping, important agents in slope retreat and headward gully migration. Thresholds and limits are important in many chemical and mechanical groundwater actions. A quantitative, morphometric approach to groundwater landforms and processes is exemplified by selected studies in carbonate and clastic terrains of ancient and recent origins. Received, May 1998 · Revised, September 1998 · Accepted, October 1998  相似文献   

Hydrochemical evidence for mixing of river water and groundwater during high-flow conditions, lower Suwannee River basin, Florida, USA     

Christy A. Crandall  Brian G. Katz  Joshua J. Hirten 《Hydrogeology Journal》1999,7(5):454-467

 Karstic aquifers are highly susceptible to rapid infiltration of river water, particularly during periods of high flow. Following a period of sustained rainfall in the Suwannee River basin, Florida, USA, the stage of the Suwannee River rose from 3.0 to 5.88 m above mean sea level in April 1996 and discharge peaked at 360 m³/s. During these high-flow conditions, water from the Suwannee River migrated directly into the karstic Upper Floridan aquifer, the main source of water supply for the area. Changes in the chemical composition of groundwater were quantified using naturally occurring geochemical tracers and mass-balance modeling techniques. Mixing of river water with groundwater was indicated by a decrease in the concentrations of calcium, silica, and ²²²Rn; and by an increase in dissolved organic carbon (DOC), tannic acid, and chloride, compared to low-flow conditions in water from a nearby monitoring well, Wingate Sink, and Little River Springs. The proportion (fraction) of river water in groundwater ranged from 0.13 to 0.65 at Wingate Sink and from 0.5 to 0.99 at well W-17258, based on binary mixing models using various tracers. The effectiveness of a natural tracer in quantifying mixing of river water and groundwater was related to differences in tracer concentration of the two end members and how conservatively the tracer reacted in the mixed water. Solutes with similar concentrations in the two end-member waters (Na, Mg, K, Cl, SO₄, SiO₂) were not as effective tracers for quantifying mixing of river water and groundwater as those with larger differences in end-member concentrations (Ca, tannic acid, DOC, ²²²Rn, HCO₃). Received, March 1999 / Revised, July 1999 / Accepted, July 1999  相似文献   

水文学与水力学相结合的南四湖洪水预报模型   总被引：7，自引：0，他引：7  

李致家  包红军  孔祥光  陈界仁  杨殿亮 《湖泊科学》2005,17(4):299-304

作为“滇池沿岸带生态修复技术研究及工程示范”系列研究论文之一,主要分析研究了滇池东北部沿岸带原有生 态状况、现有环境基础、实施局部岸段生态修复的有限目标、实现这一目标的主要限制性环境因子及其可控性．结果显 示,滇池东北部沿岸带入湖河流密集,发育良好的湖滩湿地原本是拦截净化入湖河水的生态屏障;湖滩湿地被围垦之后, 人工岸堤前风浪侵蚀强烈,水生植物和水生动物消失,但沙质沉积物淤积形成了次生浅滩;在次生沙滩上创建挺水植被, 仍然可以发挥沉积掩埋污染物、捕获分解漂浮性蓝藻的污染控制功效;实施生态修复所面临的限制性环境因子主要为风 浪的强烈冲刷和水质严重污染,这些因素都可以通过相应的环境改造与控制措施加以解决,因而实现生态修复目标是可 能的．  相似文献   

辽河油田滨海区海月潜山油气评价     

武世尧  吕炳全  王红罡  赵会民 《海洋地质与第四纪地质》2004,24(1):99-104

在辽河盆地中,海月潜山是一个典型的、由下古生界碳酸盐岩组成的规模较大的潜山。通过对海月潜山的地层、构造和构造应力场等分析,得出潜山西北边缘有一个裂缝发育带和潜山内4个较强的张应力区和张扭应力区,正好与4个构造圈闭吻合,它们是油气储集区．并发现潜山顶部局部保留有残留古风化壳,风化壳中网状裂缝是重要的油气储集空间。这些表明海月潜山是一个具有勘探潜力和油气远景的潜山区,它是我国东部中、新生代含油气盆地之下潜山油气藏勘探的一个很好范例。  相似文献   

四川诺水河地质公园地质遗迹景观资源特征     

曹俊  杨俊义 《四川地质学报》2005,25(2):110-114

诺水河地质公园位于通江县北部,地理区位条件较优越,地质遗迹景观资源十分丰富,分布广,成因类型多样,景观规模大,景观品质高,以岩溶洞穴钙华堆积景观为主的导向型景观资源特色突出,个性鲜明,其它配套景观相对集中,互补性强,配套性好,具有重要的科研、科考价值,美学观赏价值,保护价值和旅游开发价值。  相似文献   

综合物探在京珠高速公路粤境北段岩溶探测中的应用     

武斌  曾校丰 《四川地质学报》2005,25(3):190-192

通过三种物方法在京珠高速公路粤境北段岩溶探测中应用,充分表明其在岩溶探测中特别有效。  相似文献