A study on reserves and water holding function of litter in four types of evergreen broadleaved forest in subtropical zone of China

ZHAO Yuhong, FAN Shaohui, XIA Chen

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (06) : 93-98.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (06) : 93-98. DOI: 10.3969/j.issn.1000-2006.2015.06.017

A study on reserves and water holding function of litter in four types of evergreen broadleaved forest in subtropical zone of China

  • ZHAO Yuhong1,2, FAN Shaohui2*, XIA Chen3
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Abstract

In order to explore the litter hydrological functions in four types of forest stands in the process of Phyllostachys edulis expansion to evergreen broadleaved forest in subtropical zone of China, this paper studied the reserves and hydrological parameters of litter in semi-decomposed layer and undecomposed layer such as the maximum water holding capacity and rate, the water absorption rate and the effective interception amount under four kinds of forest stand: evergreen broad-leaved forest, bamboo(20%)- broadleaf(80%)mixed forest, bamboo(80%)-broadleaf(20%)mixed forest and Mao bamboo pure forest in Dagangshan mountain forest ecological station, Jiangxi Province. The results were shown as follows: ① the total litter reserves in four kinds of forest stand could be arranged from high to low as: Mao bamboo pure forest > bamboo(80%)-broadleaf(20%)mixed forest > bamboo(20%)- broadleaf(80%)mixed forest > evergreen broadleaved forest. And litter reserves of semi-decomposed layer was higher than that of undecomposed layer. Effective interception rate of bamboo(20%)- broadleaf(80%)mixed forest was the highest, which was 0.78, slightly higher than that of the Mao bamboo forest(0.77). The lowest interception rate was found in broad-leaved forest(0.42). ② The waterholding capacity of litter in different stands with various decomposition rate was consistent. Due to limited reserves, the waterholding quantities in broad-leaved forest were the smallest in both undecomposed and semi-decomposed layers, which were respectively 0.33 mm and 0.44 mm. ③ The relationship between water holding capacity and immersion time in litter of four forest stands could be shown in the equation: S=aln(t)+b, water holding capacity of litter increased rapidly within the first four hours, then rose slowly. While, the equation of the relationship between water absorption rate and immersion time was: V=atn, and the litter water absorption rate decreased rapidly within the first two hours, then the rate was steady after two hours. By comprehensively analyzing litter reserves, water holding capacity and effective interception capacity, four kinds of stands hydrological effects of litter stand was difficult to clearly sort, its complex mechanism needs further study. Bamboo forest in terms of reserves and water holding capacity were significantly better than the evergreen broad-leaved forest, water conservation capacity, along with the evergreen broad-leaved forest was gradually being replaced by Mao bamboo pure forest, hydrological function of litter also increased.

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ZHAO Yuhong, FAN Shaohui, XIA Chen. A study on reserves and water holding function of litter in four types of evergreen broadleaved forest in subtropical zone of China[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2015, 39(06): 93-98 https://doi.org/10.3969/j.issn.1000-2006.2015.06.017

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