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《Scientia Silvae Sinicae》 2010-10
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Water-Holding Characteristics of the Litter under Main Tree Species Plantations in Beijing Xishan Mountainous Areas

Zhang Feng1 Peng Zuodeng1 An Yongxing1 Chen Junqi2 Ren Yunmao3(1. Key Laboratory for Silviculture and Conservation of Ministry of Education,Beijing Forestry University Beijing 100083;2. Beijing Muricipal Bureau of Parks and Forestry Beijing 100029;3. Beijing Xishan Forest Farm Beijing 100093)  
This paper mainly studied water-holding characteristics of forest litter of six tree species(Robinia pseudoacacia,Platycladus orientalis,Acer truncatum,Cotinus coggygria,Pinus tabulaeformis,Quercus variabilis) in Beijing Xihan forest health demonstration areas. The results showed that: 1) The total litter storages in the 6 different forests were: 26. 01 t·hm-2 for A. truncatum,10. 82 t·hm-2 for Q. variabilis,8. 96 t·hm-2 for C. coggygria and 4. 52 t ·hm-2 P. orientalis. The order was P. tabulaeformis A. truncatum Q. variabilis R. pseudoacacia C. coggygria P. orientalis. 2) The dynamic changes in water-holding capacity,water-absorbent rate and time of forest litters under different forests were basically similar. Water-holding capacity of the non-decomposed litter was greater than that of the half-decomposed litter. The water holding capacity of litter had a positive correlation with the duration of water immersion. Being immersed in water for 8 h,the forest litter usually reached its maximum water-holding capacity. That is to say,after 8 h,the water holding capacity had no longer significant changes with further increase in soaking time;in the initial 2 h,the water-absorbent rate of non-decomposed and half-decomposed litter was fastest;in 4-6 h afterimmersion,the rate rapidly decreased;6 h later,the rate of decline slowed down significantly,and the water-absorbent rates of the two kinds of litters converged. 3) The largest water holding ratio ranged from 75. 44 percent to 278. 65 percent among different forest litters. The biggest water holding ratio of conifer species was smaller than that of the broad-leaved species except Pinus tabulaeformis forest litter which had significantly higher ratio than other broad-leaved species. The order of the greatest water-holding capacity in different forest litters was: P. tabulaeformis Q. variabilis A. truncatum R. pseudoacacia C. coggygria P. orientalis. 4) The effective retain of different f forest litters was: Q. variabilis 2. 33 mm,P. tabulaeformis 2. 12 mm,A. truncatum 2. 00 mm,R. pseudoacacia 1. 19 mm,C. coggygria 0. 89 mm,P. orientalis 0. 23 mm,and the order was: Q. variabilis P. tabulaeformis A. truncatum R. pseudoacacia C. coggygria P. orientalis.
【Fund】: 北京市科委重大科技项目“北京山区森林健康经营关键技术研究与示范”(D0706001000091)
【CateGory Index】: S714
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