The results show that the main causes of small-old trees are the soil water deficiency, the low water utilization rate and the low fertility in soil.
研究结果表明，形成小老树的主要原因是土壤水分亏缺、水分利用率低和土壤肥力不足。
Dixie pushed me back to my apartment, through the quiet neighborhood of small, old houses and big, old trees.
穿过家旁安静的街道，那些古老的小房子和沧桑的大树，Dixie把我推回了我的房间。
They went past small villages and burgeoning housing developments, past abandoned apple orchards, back to where trees and brush have devoured old homesteads.
他们穿过一座座小村庄和一座座拔地而起的房屋，穿过废弃的苹果园，来到了树林和灌木丛掩映的老农场。
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