YE Hai-ying,ZHAO Ting-ning,ZHAO Zhi-feng.The Litter Storage and Its Water Capacity Characteristics in Different Artificial Soil and Water Conservation Forest Stands of Hilly and Gully Regions on the Loess Plateau[J].Research of Soil and Water Conservation,2009,16(01):121-125,130.
半干旱黄土丘陵沟壑区几种不同人工水土保持林枯落物储量及持水特性研究
- Title:
- The Litter Storage and Its Water Capacity Characteristics in Different Artificial Soil and Water Conservation Forest Stands of Hilly and Gully Regions on the Loess Plateau
- Keywords:
- hilly and gully region on the Loess Plateau; soil and water conservation forset; the litter storage; water capacity characteristics
- 分类号:
- S727.22;S715
- 摘要:
- 通过对土桥沟流域SW33-SW75坡向的4种类型人工水土保持林（油松纯林、刺槐纯林、侧柏纯林、油松刺槐混交林）林下枯落物储量的调查结合室内持水试验，运用数理统计的方法分别得到4种林分林下枯落物的储量、最大储水量、吸水速率等水文特征参数。结果表明：①4种林分的单位面积枯落物蓄积量2.35～3.32 t/hm2，其由大到小的排列顺序为：油松林>油松刺槐混交林>侧柏林>刺槐林；②4种林分枯落物的最大持水量存在一定的差异。油松刺槐混交林、油松林、刺槐林、侧柏林的枯落物最大持水量分别相当于0.739，0.73，0.663，0.524 mm的降雨。这4种林分枯落物最大可吸收其自身重量2.11～2.90倍的降雨；③4种林分枯落物的未分解层和半分解层的持水量与时间呈线性相关，在浸水的前2 h内，吸水速度较快，随着时间的延长趋势逐渐变缓，当枯落物在水中浸泡8 h时，持水量基本上达到最大值；④枯落物未分解层和半分解层的吸水速率与时间之间存在一定的相关关系，在浸水的前0～2 h，吸水速率较快，4～6 h后下降速率逐渐减缓。
- Abstract:
- The hydrological character parameters of the litter storage,the maximum water holding capacity and water absorption speed of the litter on the forest land under four kinds of soil and water conservation forest(pure Pinus tabulaeformis forest,pure Robinia hisqida forest,pure Platycladus orientalis forest,mixed forest of Pinus tabulaeformis and Robinia hisqida)in Tuqiaogou basin were studied in this paper.The results showed:① The litter storage of the four kinds of forest ranges from 2.35 t/hm2 to 3.32 t/hm2.The sequence of the litter storage is pure Pinus tabulaeformis forest>mixed forest of Pinus tabulaeformis and Robinia hisqida>pure Platycladus orientalis forest>pure Robinia hisqida forest;②There are some differences in maximum water holding capacity of the four kinds of forest.The maximum water holding capacity of the mixed forest of Pinus tabulaeformis and Robinia hisqida is equivalent to the rainfall of 0.739 mm, pure Pinus tabulaeformis forest 0.73 mm, pure Robinia hisqida forest 0.663 mm, pure Platycladus orientalis forest 0.524 mm. The four kinds of forest litter can absorb the rainfall from 2.11 to 2.9 of their dry weight;③The relationship of four undecomposed litter and half-decomposed litter of water holding capacity and immersion time is that the water will be absorbed very quickly by the litter in the first 2 hours. But it will be slowed down and reach the peak after 8 hours. ④ The relational expression of the absorption rate and immersion time is that, between 0～2 h,litter absorb water speed very fast,drop the speed to slow down gradually after 4～6 h.
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备注/Memo
收稿日期:2008-7-24。
基金项目:“十一五”国家科技支撑项目（2006BAD03A1201）
作者简介:叶海英（1982- ），女，陕西岚皋人，在读硕士，主要研究方向：工程绿化。E-mail：cassieye@163.com
通讯作者:赵廷宁（1962- ），男，河北阳原人，教授，博士生导师，主要研究方向：工程绿化。E-mail：zhtning@bjfu.edu.cn