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树根周围为什么要放一层卵石

2011-11-09 21:43:37| 分类：植物天地 | 标签： |举报 |字号大中小订阅

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到处进行国家文明城市评比，上上下下、大搞建设; 虽说有千城一面之嫌，客观上倒也美化了城市--住宅附近的人行道经过整治，就悦目了不少。

尤其是两旁的行道树，精心修建之余，更是围上了一圈卵石;

那么, 提问: 树根周围为什么要放一层卵石?

回答:

在土壤里，土粒之间有许多空隙; 而土壤里的水分会顺着这些空隙往外渗透。这样，太阳一晒水分就蒸发了，土壤里的水分就会减少; 为了保持根部水分，人们便在树周围放些卵石，能够减少水分的蒸发速度，保持土壤的水分。

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