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.
动力学模型需要大量的田间实测资料，主要应用于农田氮素循环、定量评价水氮资源利用率、优化水肥管理措施等方面。
The DPM method needs lot of field data, mainly to study nitrogen cycle in field, assess water and nitrogen usage efficiency and optimize management soil water and nitrogen fertilizer.
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.
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.
改善农田养分循环的途径是建设基本农田、增施有机肥料和调整种植结构等。
Therefore, the way of improving nutrient circulation is to build farmland with high productivity, apply more organic fertilizer and readjust the structure of plant.
从作物需水量的基本概念出发，以水量平衡原理为基础，建立了模拟农田根层土壤水循环的计算机模型- IS AREG。
ISAREG is an irrigation scheduling simulation model based on the concept of crop water requirements and soil water balance.
从作物需水量的基本概念出发，以水量平衡原理为基础，建立了模拟农田根层土壤水循环的计算机模型- IS AREG。
ISAREG is an irrigation scheduling simulation model based on the concept of crop water requirements and soil water balance.
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