第五章农田生态系统水环境损害成本的计量。
Chapter Five: Measurement about the water environmental damage cost from field ecosystem.
农田生态系统对土壤肥力具有较强的保护作用。
So the soil agro-ecological system has a strong protective effect on soil fertility.
农田生态系统钾平衡研究对作物生产有重要意义。
Then potassium balance studies in agroecosystem are especially necessary for crop production.
对李家村农田生态系统的能流物流进行了分析和评价。
Energy and material flux in Lijia village farmland ecosystem were analysed and evaluated.
稻—麦轮作期紫色土农田生态系统钾素平衡状况怎样？
Whether was potassium balance kept in purple soil cornfield ecosystem under a rotation of rice and wheat?
论述考虑地下水中硫投入的农田生态系统中硫的平衡。
The research of sulphur balance in agro-ecosystem was reviewed with special regard to the input to groundwater.
并对提高农田生态系统投入产出效益的途经和措施进行了探索。
It tells how to get maximum economy benefit and ecological benefit with minimum input on the basis of energy classifying and benefit analysis of input-output.
目前的研究表明大气中约80%的N_2O增长量来自农田生态系统。
Recent research suggested that about 80% net increase of atmospheric N_2O was probably caused by agro-ecosystems.
在一定的水文条件和气候条件下，地下水中的硫对农田生态系统中硫平衡起重要作用。
The sulphur input through groundwater playes an important role in sulphur balance under a special hydrological and climatic conditions.
土壤氮素矿化研究对从农田生态系统氮素平衡到全球变化和环境问题均具有重要意义。
Mineralization of nitrogen from various sources can contribute significantly to soil nitrogen balance, to total plant nitrogen availability, and to environmental quality and global change.
农田生态系统中的氮循环是影响农业生产力的主要因素之一，同时也会对环境产生影响。
Nitrogen cycling in farmland ecosystem is one of the key factors to affect agricultural productivity and at the same time it affects the environment.
农田生态系统中的氮循环是影响农业生产力的主要因素之一，同时也会对环境产生影响。
Modeling nitrogen cycling in studying farmland ecosystem has been an important tool and has been paid much attention.
农田生态系统可以理解为是一个较大的景观区域，包括各种不同的作物生境和非作物生境。
An agroecosystem can be understood as a large, landscaped area, which includes a variety of crop habitats and non-crop habitats.
湖州市四种农田生态系统中，以林草系统最稳定，而桑园系统最容易发生土壤微量元素的缺乏状况。
In the four agricultural ecosystem of Huzhou City the forest-grass ecosystem was the most stable and the Mulberry ecosystem easiest to suffer the lack of the trace elements.
农田生态系统中氮素养分主要的输入项是化肥和有机肥，分别占总投入氮量的58.8%和25.3%。
The major input of N was the N of fertilizer and manure and the percentage was 58.85% and 25.32% of the total input respectively.
利用生态学和经济学统计方法分析了1950-2000年庙岛群岛海岸带农田生态系统服务价值的演替变化。
The successive variation in ecosystem service value of farmland in Miaodao archipelago from 1950 to 2000 is analyzed by using ecological and economics methods.
农业植被净初级生产力代表了农田生态系统固定大气co_2的能力，是陆地生态系统碳循环的重要组成部分。
Plant net primary production (NPP) of agriculture vegetation represents the capacity of sequestrating atmospheric CO2 in agro-ecosystem, and plays an important role in terrestrial carbon cycling.
对近年来国内外农田生态系统中的水分、溶质和养分迁移的研究工作进行了评述，并指出了需进一步研究的问题。
In this paper, the recent researches on the movement and transport of the water, solute, nutrient and bed-load in farmland ecosystem are reviewed and the research prospects in future are pointed out.
对华北平原高产农田生态系统2004年的土壤呼吸状况进行了分析，探讨了不同耕作方式下土壤呼吸量的季节变化规律。
This study investigated variations in soil respiration under different cultivation practices on high yield farmland in the North China Plain during 2004.
这些农田土壤的种植、翻耕、施肥、灌溉等管理措施不仅改变着农田生态系统中的化学元素循环，且给全球气候变化带来影响。
The management, such as plough, fertilization and irrigation etc. have not only changed the nutrient cycling in the farmland ecosystem system, but also brought influences to global climate.
土地利用、耕作、作物类型、种植密度、灌溉、施肥以及其他人为活动等，对农田生态系统土壤有机碳库的变化均能产生影响。
Land use, cultivation, crop selection, planting density, irrigation, fertilization, and other anthropogenic activities all affect the dynamics of SOC pool.
利用布设在黑河流域中游的张掖绿洲区的一套自动气象观测系统在2003- 2004年的资料，分析了一个完整年度内春小麦和夏玉米间作农田生态系统的辐射收支及其变化特征。
Based on the experiments conducting in an intercropping field in Zhangye Oasis in the middle reach of Heihe River basin in 2003-2004, the characteristics of radiation budget are analyzed.
利用布设在黑河流域中游的张掖绿洲区的一套自动气象观测系统在2003- 2004年的资料，分析了一个完整年度内春小麦和夏玉米间作农田生态系统的辐射收支及其变化特征。
Based on the experiments conducting in an intercropping field in Zhangye Oasis in the middle reach of Heihe River basin in 2003-2004, the characteristics of radiation budget are analyzed.
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