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亚热带北缘湿地松脂材兼用林凋落物持水特性
杜杰,袁莉芹,蔡天培,陈杰,刘西军
0
(安徽农业大学林学与园林学院,合肥 230036)
摘要:
为研究亚热带北缘湿地松脂材兼用林(RT, resin and timber)凋落物水源涵养功能,以安徽省宣城市宣州区宛陵林场内的湿地松脂材兼用林和湿地松未采脂人工林(CK)为研究对象,采用烘干法、浸泡法对凋落物现存量及其持水能力进行研究。结果表明:(1)湿地松脂材兼用林凋落物以凋落叶为主,总现存量为10.18 t·hm-2,显著小于对照林分(P < 0.05)。(2)湿地松脂材兼用林凋落物的总最大持水量与平均最大持水率(12.97 t·hm-2 , 125.09%)均低于对照林分(21.73 t·hm-2;136.54%),未分解层 (UL, un-decomposed layer)和半分解层(SL, semi-decomposed layer)最大持水率分别降低了11.38%和4.03%。(3)湿地松脂材兼用林凋落物吸水速率在浸泡0 ~ 0.5 h内最大,且各分解层最大吸水速率(UL, 1.28 g·g-1·h-1;SL, 2.41 g·g-1·h-1)均低于对照林分(UL, 1.58 g·g-1·h-1;SL, 2.56 g·g-1·h-1)。(4)湿地松脂材兼用林凋落物持水量与浸水时间均呈极显著对数函数关系(R2 > 0.95)。湿地松脂材兼用经营模式降低了凋落物现存量和持水性,不利于湿地松人工林凋落物层的水源涵养。
关键词:  湿地松;脂材兼用林;凋落物;蓄积量  持水能力
DOI:10.13610/j.cnki.1672-352x.20220325.015
投稿时间:2021-04-25
基金项目:国家重点研发计划项目(2017YFD0600502)和安徽省自然科学基金项目(1908085MC73)共同资助。
The water-holding characteristics of litterfall in Pinus elliottii plantations for resin and timber in northern of subtropical area
DU Jie,YUAN Liqin,CAI Tianpei,CHEN Jie,LIU Xijun
(School of Forestry and Landscape Architecture, Anhui Agricultural University, Hefei 230036)
Abstract:
In order to study the water conservation function of the litterfall in slash pine plantations in the northern subtropical area, we investigated the accumulation amount and water-holding capacity of the litterfall in Pinus elliottii plantations, which located in the Wangling Forest Farm, Xuanzhou District, Xuancheng City, Anhui Province, using the drying method and soaking method in slash pine plantations for both resin and timber (RT), respectively, taken the slash pine plantation (no resin) as the control group (CK). The results showed that: (1) The majority of litterfall of slash pine plantations for both resin and timber was needle litter, and the total litterfall accumulation was 10.18 t·hm-2. The total litter accumulation was significantly less than CK (P < 0.05). (2) The total maximum water-holding capacity and the average maximum water-holding rate of the litterfall in RT(12.97 t·hm-2,125.09%)were lower than those of CK (21.73 t·hm-2; 136.54%). The maximum water-holding rate of the un-decomposed layer (UL) and semi-decomposed layer (SL) in RT decreased by 11.38% and 4.03%, respectively. (3) The water absorption rate of litterfall in RT reached the largest value within 0 - 0.5 h of immersion, and the maximum water absorption rate of each decomposition layer in RT (UL, 1.28 g·g-1·h-1; SL, 2.41 g·g-1·h-1) was lower than that of CK (UL, 1.58 g·g-1·h-1, SL, 2.56 g·g-1·h-1). (4) The significantly logarithmical correlations between water-holding capacity of litter and immersion time were found (R2 > 0.95). In conclusion, the management model of slash pine plantation for both resin and timber reduces the litterfall accumulation and its water-holding capacity, which is not conducive to the water conservation of the slash pine plantation.
Key words:  slash pine  plantations for both resin and timber  litter  volume  water-holding capacity

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