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生境质量 - Open Access .click
Results 51 to 60 of about 10,948 (106)

延河流域生态系统服务时空演变特征及权衡协同关系

open access: yesShuitu Baochi Xuebao
目的探究延河流域生态系统服务的时空演变及权衡/协同关系,为该流域开展针对性水土流失治理,实现区域高质量发展提供科学依据。方法基于1980—2020年土地利用数据、土壤数据、气象数据和数字高程模型(DEM)数据等多源数据,运用ArcGIS和InVEST等模型,评估该流域1980—2020年4种生态系统服务的时空演变格局及其权衡/协同关系。结果1)研究期内,流域的产水量年际平均值为2.04×108 m3(径流深26.55 mm),呈“几”字形变化趋势,单位面积产水量先升后降再升。空间分布上 ...
李婷, 支若晨, 张超
doaj   +2 more sources

湖泊水环境承载力研究

open access: yesShuitu Baochi Xuebao, 2004
以博斯腾湖为实例研究湖泊的水环境承载力,从湖泊水环境承载力的承载媒介(水资源量和水体质量)入手,以湖泊水环境承载力的承载对象(人口、污染物质、人类活动等等)为基础,建立湖泊水环境承载力研究概念模型和量化模型,通过建立湖泊生态需水量模型、湖泊环境需水量模型,结合系统动力学法计算了博斯腾湖的水资源量承载力,结合二维水流——水质模型模拟了湖泊中的污染物质(BOD、TN、矿化度)浓度分布,通过各点浓度分布经过聚合得到整个湖泊不同水位、不同来水频率下的水环境容量、富营养化水平、矿化度水平,而博湖的有机污染加剧 ...
王玉敏 周孝德 冯成洪 李家科
doaj  

医学生睡眠质量影响因素的通径分析

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2008
[目的] 了解海南省医学大学生睡眠质量的影响因素。[方法] 采用匹兹堡睡眠质量指数自评量表(PSQI)、症状自评量表(SCL-90)、艾森克人格问卷(EPQ)及自制的睡眠质量影响因素调查表,对海南医学院551名大一到大五的本科生进行调查。[结果] ①匹兹堡睡眠质量总平均得分为5.74(s=2.78)分,21.42%的学生睡眠质量有问题。男女差别无统计学意义。②通径分析结果显示学习负担和应激事件是睡眠质量差的诱发因素,但不起主要作用,人格因素、年级直接和间接作用于中间变量对睡眠质量产生影响作用 ...
王小丹, 高允锁, 郭敏
doaj  

通什水幸福河湖建设与流域水生态环境修复研究——以五指山市南圣河为例

open access: yesRenmin Zhujiang
为支撑通什水幸福河湖建设与流域水生态环境治理,基于2022、2025年通什水南圣河段水环境、水生态、鱼类群落及底质环境数据,系统探究该河段水生态环境演变特征及工程干预效应,提出针对性修复路径。结果表明:2022—2025年,受昌化江上游滨河雨林生态修复工程影响,南圣河段水环境质量整体改善,DO含量提升18.3%,COD、BOD5、NH3-N、TP浓度分别下降20.0%、2.2%、16.0%、34.7%,鱼类群落多样性指数(Shannon-Wiener)从0.95提升至1.08,但生境异质性不足 ...
王璐畇, 赵惊鸿, 王海波
doaj  

科尔沁沙地不同土地利用变化的生态系统服务功能

open access: yesShuitu Baochi Xuebao
目的量化科尔沁沙地生态系统服务功能时空演变,为环境治理与生态修复提供科学依据与理论支撑。方法基于最近3期(2000年、2010年、2020年)土地利用类型数据,利用InVEST模型量化评估科尔沁沙地年产水量、水质净化(磷负荷)、土壤保持、碳储量及生境质量5项关键生态系统服务指标,并计算生态系统服务指数。结果1)生态用地(草地、林地)与建设用地逐期增长,耕地、未利用地与水域持续减少。2) 年产水量逐期呈增加趋势,平均值从131.19 mm上升至266.39 mm,其中西部较高值区(300.00~400 ...
苏鑫森   +5 more
doaj   +2 more sources

[Family Environmental Unpredictability and Adolescent Physiological and Psychological Health: The Buffering Role of Positive School Climate]. [PDF]

open access: yesXin Li Xue Bao
倩 高   +15 more
europepmc   +1 more source

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