摘要
明确间伐对杉木人工林凋落物分解与养分释放的影响,以期为人工林持续性经营提供科学指导。以福建省洋口国有林场板桥管护站13年生杉木人工林为研究对象,2019年设置未间伐(CK,保留密度2505株/hm^(2))、轻度间伐(LIT,保留密度1500株/hm^(2))、中度间伐(MIT,保留密度1200株/hm^(2))、重度间伐(HIT,保留密度900株/hm^(2))4个处理。2020年于试验林地内采用原位分解法分析不同间伐强度处理下杉木人工林凋落物,历经1年分解时间后,其分解速率和养分释放速率的变化。结果表明,未间伐、轻度、中度、重度间伐下杉木人工林凋落物年分解速率依次为0.27,0.34,0.32,0.30 g·g^(-1)·a^(-1);相较于未间伐,轻度、中度、重度间伐处理下杉木林凋落物分解速率分别提升25.93%、18.52%、11.11%。不同强度间伐下,杉木林凋落物C含量在180 d前下降显著,之后波动相对平稳,N、P含量呈先释放后固持的模式。双因素方差分析表明,处理和分解时间对凋落物分解速率和C、N、P养分释放影响显著。短期来看,不同强度间伐均能促进凋落物分解,加速养分周转,但随着间伐强度增加,凋落物分解速度减缓。今后建议选取轻度间伐,以调控林分结构,促进养分循环。
To better understand the impacts of thinning on litter decomposition and nutrient release of Chinese fir plantations,and provide scientific guidelines for long-term plantation management,taking the 13-year-old Chinese fir plantations at Banqiao Management Station,Yangkou State-Owned Forestry Farm,Fujian Province,China,as the research objects to carry out the thinning experiment.Four treatments were established in 2019:no thinning(control,with the initial retention density of 2505 plants/hm^(2)),light thinning(LIT,retention density:1500 plants/hm^(2)),medium thinning(MIT,retention density:1200 plants/hm^(2)),and heavy thinning(HIT,retention density:900 plants/hm^(2)).In 2020,the in-situ decomposition method was adopted to examine the changes in decomposition rate and nutrient release rate of litters after one year of decomposition in the experimental forest under various thinning intensity treatments.The annual decomposition rates of litter fall in four treatments mentioned above were 0.27,0.34,0.32,and 0.30 g·g^(-1)·a^(-1),respectively.Compared with the control,the decomposition rates of litter fall increased by 25.93%,18.52%,and 11.11%,respectively under light,medium,and heavy thinning treatments.The carbon content of litters declined dramatically in 180 days after thinning and subsequently fluctuated reasonably and smoothly,but the N and P contents showed a pattern of first being released and then being fixed.Two-way ANOVA showed that treatment and decomposition time had significant effects on the litter decomposition rate and C,N and P nutrient release.In the short term,thinning with different intensities could promote the litter decomposition and accelerate nutrient turnover,but the litter decomposition rate decreased as the thinning intensity increased.In the future,it is recommended to select light thinning to regulate the Chinese fir plantations and promote nutrient cycling.
作者
陈家琛
左晓东
陈立
朱琴
孟芳芳
廖文海
范福金
曹光球
曹世江
CHEN Jia-chen;ZUO Xiao-dong;CHEN Li;ZHU Qin;MENG Fang-fang;LIAO Wen-hai;FAN Fu-jin;CAO Guang-qiu;CAO Shi-jiang(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,Fujian,China;Chinese Fir Engineering Technology Research Center,National Administration of Forestry and Grassland,Fuzhou 350002,Fujian,China;Yangkou State-Owned Forest Farm,Shunchang 353211,Fujian,China)
出处
《西北林学院学报》
CSCD
北大核心
2023年第2期119-125,共7页
Journal of Northwest Forestry University
基金
“十三五”国家重点研发计划项目(2016YFD0600301)
国家自然科学基金(71201800739)
福建农林大学林学高峰学科(71201800739)。
关键词
杉木
间伐
凋落物分解
养分释放
litter decomposition
thinning
nutrient release
Chinese fir plantation
