④种树种草，营造农田防护林，建立新的农业生态系统。
Plant trees and grasses, and protective froest, form new agr-ecosystem.
本文研究了不同作物留茬和建设农田防护林对遏制农田土壤风蚀的效应。
The effects of the stubble of different crops and farmland windbreak on controlling farmland soil erosion are studied.
评价农田防护林景观的合理性、稳定性、持续性，是今后的重要研究方向。
Evaluating the reasonability, stability and durability of shelterbelt landscape based on the theories and methods of landscape ecology was an important task in the future studies.
用地转偏差方法估算辽宁省彰武县农田防护林体系的区域性防风效应，平均值为14％；
Regional wind protective effect of farmland windbreak system in Zhangwu county were calculated by geostrophic deviation method. The average effect is 14%.
通过对各土类农田防护林林分蓄积生长量和土壤生产力的综合分析，把河西走廊立地级划分为四类。
Site level in Hexi-corridor area was divided into 4 types by comprehensive analyzing the growing stock of stand and soil productivity of all kinds of farmland shelterbelt.
这些防护林带有效地保护了农田，使之免受流沙侵袭。
These tree belts effectively protect the farmland against shifting sand.
这些防护林带保护了50万英亩农田不受流沙侵袭。
These tree belts protected 500,000 acres of farmland against shifting sand.
这些防护林带保护了50万英亩农田不受流沙侵袭。
These tree belts protected 500,000 acres of farmland against shifting sand.
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