Its Benefit of Shel terbelt and Infl uence on Crop Yields

Liu Kang; Chen Yie

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Its Benefit of Shel terbelt and Infl uence on Crop Yields

- Its Benefit of Shel terbelt and Infl uence on Crop Yields
- Bulletin of Soiland Water Conservation Vol. 12, Issue 5, Pages: 39-43(1993)
- 作者机构：
  
  陕西省中国科学院西北植物研究所陕西杨陵,712100
- 作者简介：
- 基金信息：
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- Published：1993
- 稿件说明：
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Liu Kang, Chen Yie. Its Benefit of Shel terbelt and Infl uence on Crop Yields[J]. Bulletin of Soiland Water Conservation, 1993, 12(5): 39-43.
DOI：

Liu Kang, Chen Yie. Its Benefit of Shel terbelt and Infl uence on Crop Yields[J]. Bulletin of Soiland Water Conservation, 1993, 12(5): 39-43. DOI：

摘要

以大官杨

新疆杨为主的塬面农田防护林可有效的削弱风速

最佳防护区在树高的3至7倍处。林带在春季无叶期可提高农田表面的气温和空气相对湿度;夏季可降低气温

增加空气相对湿度。林带两侧有效防护区内冬小麦与春玉米产量明显高于对照区。同时在林带附近存在严重的胁地现象

尤以树高1倍范围内较明显。胁地的主要原因是树木根系与农作物争夺水分和养分

以及树冠遮荫引起日照减少、光照强度减弱及小气候的变化

以致造成农作物减产。

Abstract

Benefit of shelterbelt and its influence on crop yields in west region of Weibei loess plateau was studied in this paper。The results showed that the shelteibelt was able to weaken wind speed by 22. 2Yo in spring. The best defensive effect place was for from the tree in a distance about 3^"7 times of the tree height. The microlimatic conditions were improved on both sides of windbreak，so that wheat yield in the fields among the shelterbelts was increased by 11%~22 0 o

and the corn by 1.5%-14.4% on protected zone The side effects of windbreak was also disscussed. The reason of reduction of output in belts was mainly that the roots.. of the tree competed soil water with crops and the crowrn produced sunshade.

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