防蚀有效植被的结构特征探讨

Structural characteristics of effective vegetation for preventing soil erosion.

通过群落结构要素类比分析表明,植被盖度或郁闷度的大小并不一定就是防蚀有效植被的充分条件,植被保持水土功能还与覆盖层的高度密切相关,覆盖层高度大则不利于植被保持水土。贴地面覆盖层的发育程度(盖度或厚度)是防蚀有效植被的基本本质特征和充分必要条件,促进贴地面覆盖层的发育或关注贴地面覆盖层的变化是植被保持水土的关键。黄土高原除建造森林植被外,更应高度重视草灌植被的水土保持作用。

On the analogy of structural elements of plant communities, it is shown that magnitude of community coverage or canopy closure isn't the adequate condition of an anti-erosive effective community because the community function of soil and water conservation is related to height of coverage layer, high coverage layer is unfavorable to soil and water conservation. Developing degree (coverage or thickness) of coverage layer close to ground is the ultimate essential characteristic and the adequate necessary condition of anti-erosive effective communities. It is also a key to soil and water conservation by vegetation that we promote the development of coverage layer close to ground or pay close attention to changes of it. So it is considered that soil and water conservation function of grass and shrub should be thought highly besides constructing forests in the Loess Plateau.