Thinning promotes litter decomposition and nutrient release in poplar plantations via altering the microclimate and understory plant diversity

IF 1.7 3区 农林科学 Q2 FORESTRY Annals of Forest Research Pub Date : 2023-07-01 DOI:10.15287/afr.2023.2231
Yu Wang, Senxian Hong, Shengzuo Fang, Guangcai Cui
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Abstract

Thinning is widely employed in forest management to improve productivity, protect forest biodiversity and maintain ecosystem functions. Here a thinning experiment with four treatments (unthinned, CK; 30% tree removal from below, MB; 50% tree removal by interlaced thinning, HI; and 50% tree removal from below, HB ) was set up in the poplar plantation, while a followed decomposition experiment with four litter types was conducted under the poplar plantations of undergoing four thinning treatments using the litterbag technique. Thinning affected the microclimate, but only the heavy thinning (HI and HB) significantly enhanced photosynthetic photon flux density (PPFD) and soil moisture in the plantations during the growing season. Thinning promoted understory vegetation biomass and vegetation diversity via modifying the microclimate parameters. Pearson correlation analysis showed that PPFD and understory herbaceous biomass were significantly correlated to Shannon-Weiner diversity index. Both thinning intensity and litter type significantly affected the litter remaining mass over times. Overall, increasing thinning intensity and litter complexity enhanced decay rate, while reduced half live (t0.5) and t0.95 values. Correlation analysis showed that air relative humidity, soil temperature, air temperature and soil moisture significantly influenced the litter mass loss rates. Non-additive (synergistic) effects were observed when different litters were mixed, but the non-additive effect was most pronounced when more herbaceous species litter were mixed with poplar leaves and 50% thinning intensity was applied. Dynamics of nutrient release from different litter types were similar to those on the litter mass lose, depending on the litter quality and microclimatic conditions. Our results suggest that a thinning operation with 50% tree removal from below (HB) would maintain the structural and functional features of the poplar plantations at the similar sites.
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间伐通过改变小气候和林下植物多样性,促进杨树凋落物分解和养分释放
间伐在森林管理中被广泛应用,以提高生产力、保护森林生物多样性和维持生态系统功能。进行了4个处理的间伐试验(未间伐,对照;30%树木从下面移除,MB;50%树木被隔行间伐,HI;在杨树人工林中设置了50%的树下清除率(HB),并在采用凋落袋技术进行4种间伐处理的杨树人工林下进行了4种凋落物类型的分解试验。间伐对小气候有影响,但只有重度间伐(高间伐和低间伐)显著提高了生长季人工林的光合光子通量密度(PPFD)和土壤水分。间伐通过改变小气候参数促进了林下植被生物量和植被多样性。Pearson相关分析表明,PPFD和林下草本生物量与Shannon-Weiner多样性指数呈极显著相关。间伐强度和凋落物类型均显著影响凋落物剩余质量。总体而言,间伐强度和凋落物复杂性的增加提高了凋落物的腐烂率,降低了半衰期(t0.5)和t0.95。相关分析表明,空气相对湿度、土壤温度、空气温度和土壤湿度显著影响凋落物质量损失率。不同凋落物混用时均存在非加性(协同)效应,但当草本种较多的凋落物与杨叶混用且间伐强度为50%时,非加性效应最为显著。不同凋落物类型对养分释放的影响与凋落物质量和小气候条件的影响相似。我们的研究结果表明,在类似的地点,砍伐50%的树木可以保持杨树人工林的结构和功能特征。
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来源期刊
CiteScore
2.20
自引率
11.10%
发文量
11
审稿时长
12 weeks
期刊介绍: Annals of Forest Research is a semestrial open access journal, which publishes research articles, research notes and critical review papers, exclusively in English, on topics dealing with forestry and environmental sciences. The journal promotes high scientific level articles, by following international editorial conventions and by applying a peer-review selection process.
期刊最新文献
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