Some data indicate that the soil organic carbon density of paddy soil is higher than that of dry cropland soil in China, and has an increasing tendency over the last 20 years.
目前有资料表明，我国水稻土具有比旱地土壤较高的表土有机碳密度，且近20年来存在着升高的趋势。
Fly ash uranium sometimes leaches into the soil and water surrounding a coal plant, affecting cropland and, in turn, food.
浮尘中含有的铀有时会溶入煤电厂周围的土壤和水体中，影响农田，进而影响食物。
Soil water content forecast is base work for cropland irrigation timely.
土壤水分预报是农田适时适量灌水的基础。
Reclaiming virgin land and plowing cropland destroy soil structure and accelerate the loss of soil organic carbon (SOC).
开垦荒地和翻耕农田导致土壤结构破坏，加速土壤有机碳（SOC）损失。
The sloping cropland distributes extensively in the TGRA with serious soil losses.
三峡库区农田坡耕地多，水土流失严重。
The observed data within the Gaoquan Catchment demonstrate a nonlinear response of runoff production and soil erosion to different degrees of topographic slopes under cropland conditions.
高泉沟的观测数据还表明，不同坡度的农田产生的径流和侵蚀是非线性的。
Therefore, land use conversion from cropland to shrub land or maybe grassland, contributed to SOC sequestration and improved soil nutrients stabilization.
因此，从耕地利用土地转换为灌木林地或草地也许，有助于改善土壤有机碳养分吸收和稳定。
Based on RS and GIS, the cropland change characteristics and spatial pattern in black soil zone of Northeast China from 1986 to 2000 were analyzed.
在遥感和GIS技术的支持下，分析了东北黑土区1986 ~ 2000年耕地资源变化特征与空间格局。
The balance analysis results of soil nutrient indicated that the fertilization methods of cropland management in Chengdu Plain were firming nitrogen, controlling phosphorus and increasing potassium.
土壤养分的平衡分析结果表明，成都平原耕地土壤管理宜采取“稳氮、控磷、增钾”的施肥方法和严格控制各种点源和非点源污染物进入土壤。
This paper analyzed the situation, changes and main problems of western soil utilization, and gave some Suggestions on rational planning, economical utilization and cropland protection.
分析了西部土地利用现状、变化及存在的问题，并提出了西部土地开发利用应重视合理规划、节约用地、重视农用地保护等建议与对策。
The soil nutrient condition with different layers changed slightly under Conversion from cropland into Forest, but cropland changed significantly.
退耕林地养分含量随土层变化缓慢，而农田及撂荒地变化剧烈。
The soil nutrient condition with different layers changed slightly under Conversion from cropland into Forest, but cropland changed significantly.
退耕林地养分含量随土层变化缓慢，而农田及撂荒地变化剧烈。
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