Results 61 to 70 of about 7,054 (156)
Shuitu Baochi Xuebao, 2019 为探讨在成都平原地区冲积性水稻土上施用沼液后土壤氮磷钾元素含量的变化及养分平衡的状况，实现沼液资源化利用的绿色发展。采用田间试验，设置10个沼液施用量梯度，并以清水与常规化肥为对照。研究施用不同量沼液对土壤氮、磷、钾等养分含量的影响，并对田间各养分平衡状况进行综合分析。结果表明：当沼液施用量在108.0~126.0 t/hm2时土壤全氮、碱解氮、全钾及速效钾含量较高，为1.35~1.42 g/kg、63.31~65.34 mg/kg、12.90~13.26 g/kg、45.45~59.25 mg/kg ...
罗伟 +5 more
doaj
Guanotrophy: Waterbirds Pay for Using Resources at Their Wintering Habitats 鸟粪营养学 ：水鸟在越冬栖息地使用资源后留下回报
Integrative Conservation, Volume 3, Issue 4, Page 382-397, December 2024.Significant waterbird colonisation was recorded in the wintering period (October through March in 2018–2019 and 2019–2020) in wetlands on Central Asian and East Australasian Flyways. Different limnochemical conditions influenced nitrate and phosphate concentrations.
Arkajyoti Mukherjee +3 more
wiley +1 more source
Shuitu Baochi Xuebao, 2008 采用恒温培养法研究美国纽约Pelham Bay Park 6种典型淡水湿地沉积物中磷的吸附与解吸行为及其动力学过程。结果表明:湿地沉积物具有强烈吸附溶液中磷的功能,随着溶液中磷浓度的增加,吸附量增大;但是湿地沉积物也有释放磷到溶液中去的功能,释放量为0~41.19 mg/kg,与沉积物吸附磷量的关系不大,沉积物释放磷与沉积物的特性有关。衡量一种淡水湿地沉积物的除磷能力,可根据沉积物最大吸附磷量和吸附解吸附平衡浓度(EPC0)来衡量,6种沉积物中,磷的最大吸附能力强弱依次是:S1>S2>S3>S6>S5 ...
黄树辉, 曾光辉, 黄宏
doaj
People and Nature, Volume 6, Issue 6, Page 2431-2448, December 2024.Abstract How humans connect with nature impacts the well‐being of both people and ecosystems. Being disconnected from nature can lead to attitudes and behaviours that ultimately damage our physical and mental health and cause irreparable harm to the planet.
Xuanyi Wang, Shulin Chen
wiley +1 more source
Shuitu Baochi Xuebao, 2001 对环洞庭湖丘岗生态系统水环境要素的定位观测和小流域水平衡监测研究表明 :环洞庭湖丘岗地区水资源总量丰沛 ,可利用的集雨水量为现今农业用地最大灌溉水需求量的 2 .4 1倍 ,可维持生态系统的水量平衡。但由于雨水的季节性配置差异 ,系统水分有季节性富余与亏缺 ,一般年份 3月中旬至 7月上旬水富余 3 11.3 mm ;8月上旬至 9月下旬水亏缺 13 4 .7mm。天然降水大约 76%产生派生资源参与系统水分循环 ,其余部分主要以径流形式溢泄入下游水域。这一过程使该地区每年流失或向洞庭湖水域输送水 1 ...
谢小立 王凯荣
doaj
Wildlife Letters, Volume 2, Issue 3, Page 124-130, September 2024.Median ovum size (mm; ±1 quartile) of wood frogs from three different wetland classes (long = long hydroperiods, short = short hydroperiods, and fish presence/absence) near Churchill, Manitoba, Canada from 2014 to 2019. Data points are individual egg mass values. Abstract Optimal egg size theory predicts females must balance investment per offspring to
Jon M. Davenport +3 more
wiley +1 more source
Nutrient Retention in the Cascade Hydroelectric Stations on the Northern Jiulong River [PDF]
, 2012 水利工程在提供巨大经济效益的同时，也给人类赖以生存的自然环境与河流健康带来了严重的负面影响，出现了营养物质收支平衡被打破、水华爆发、库区泥沙淤积严重、水生生态系统遭破坏等问题。水坝拦截调蓄对河流水动力条件及生源要素生物地球化学过程的影响，正受到国内外科学家越来越多的重视。 本文以九龙江北溪梯级水电站河段为研究对象，系统研究了河段营养物质的分布特征和年际变化。在此基础上，分析了该河段营养物质收支与滞留效率。主要结论如下： （1）NH4-N、NO2-N、NO3-N平均浓度为0.47mg/L，0.15mg/L，
苏彩霞
core
Shuitu Baochi Xuebao, 2005 以集雨区水量平衡为基础,从分析坡地水文过程入手,以坡地不同生态系统雨水分配、降雨过程地表径流产量、径流过程的土壤及养分流失量为参数,以生产灌溉对集雨的要求、坡地不同生态系统对雨水侵蚀的承载力、坡地雨水运移过程对环境和区域洪涝灾害的影响为约束条件,拟合出红壤丘岗坡地农林复合生态系统构建适宜的土地利用结构:人工林占30%,人工草地占15%,果药茶园占30%,耕地占20%,自然保护区占5%。该用地比例(结构)既满足于地貌单元(集雨区)生态系统利用坡地集雨维持系统水循环平衡的要求 ...
谢小立
doaj +2 more sources
Progress in developments and applications of the HYDRUS model and associated coupling model packages [PDF]
HYDRUS model is widely used in agricultural irrigation and pollution transport because it can comprehensively consider the movement of water, heat, and pollutants in the soil-plant-atmosphere system.
Bei ZHANG +5 more
core +1 more source