摘要
探讨不同间伐年限对杉木林枯落物层和土壤层持水能力的影响,为评估杉木林水源涵养功能对间伐的响应提供科学依据.以浙西南景宁县间伐1年、间伐3年、间伐8年和未间伐的杉木林为对象,采集枯落物与土壤样品,分析测定枯落物含水率、持水能力、土壤容重、非毛孔隙度并计算相关指标.结果表明:杉木林枯落物现存量在不同间伐年限间的差异并不显著(P>0.05);枯落物持水量、持水速率与浸水时间的关系分别符合对数函数和幂函数;间伐8年的杉木林枯落物层的最大持水率、最大拦蓄率和有效拦蓄率均显著高于未间伐林分(P<0.05);间伐3年、间伐8年的杉木林枯落物最大持水量和有效拦蓄量均显著高于未间伐林分;间伐8年杉木林地0～10 cm土层土壤容重显著降低(P<0.05),非毛管孔隙度显著增大,非毛管持水量显著增加了22.4％(P<0.05),而对10～30 cm土层土壤储水性能相关指标的影响不显著(P>0.05).综上,杉木林枯落物层和土壤层的水源涵养功能随着间伐年限的延长而增强.
Abstract
This study aimed to explore the effects of thinning years on the water holding capacity of litter layer and soil layer in Chinese fir forest, thus to provide a scientific basis for evaluating the response of water conservation function of Chinese fir forest to thinning. In Jingning County, southwest Zhejiang Province, the Chinese fir forest with thinning for 1 year, 3 years, 8 years and unthinning was selected as the research object, and the litter and soil samples were collected. Then, the moisture content, water holding capacity, soil bulk density, non-capillary porosity of litter were analyzed and measured, and the relevant indexes were calculated. The results showed that there was no significant difference in the litter stock on hand of Chinese fir forest among different thinning years (P>0.05). The relationship between litter water holding capacity, water holding rate and water immersion time was in accordance with logarithmic function and power function, respectively. The maximum water holding capacity, maximum retention rate and effective retention rate of litter layer in Chinese fir forest with thinning for 8 years were significantly higher than those in the unthinned forest (P<0.05). The maximum water holding capacity and effective retention rate of litter layer in Chinese fir forest with thinning for 3 years and 8 years were significantly higher than those in unthinned forest (P<0.05). After thinning for 8 years, the soil bulk density of 0-10 cm soil layer in Chinese fir forest was significantly decreased (P<0.05), the non-capillary porosity was significantly increased, and the non-capillary water holding capacity was significantly increased by 22.4％ (P<0.05). However, there was no significant effect on the related indicators of soil water storage performance in 10-30 cm soil layer (P>0.05). In conclusion, the water conservation function of litter layer and soil layer in Chinese fir forest was enhanced with the extension of thinning years.
基金项目
百山祖国家公园科学研究项目(2021ZDLY01)
景宁畲族自治县科技计划(2023A20)
庆元县科技局项目(庆科发[2023]23号-22)
维普
万方数据