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Leaf litter decomposition characteristics and controlling factors across two contrasting forest types

Journal of Plant Ecology 2022年第6期15卷 1285-1301页

作者： Yuan-Yuan Zhao Zhuo-Ting Li Ting Xu An-ru Lou State Key Laboratory of Earth Surface Processes and Resource Ecology College of Life Sciences of Beijing Normal UniversityBeijing 100875China

Plant leaf litter decomposition provides a source of energy and nutrients in forest *** addition to traditional environmental factors,the degradation process of litter is also affected by plant functional traits and litter ***,at the community level,it is still unclear whether the relative importance of plant traits and litter quality on the litter decomposition rate is consistent.A year-long mixed leaf litter decomposition experiment in a similar environment was implemented by using the litterbag method in seven typical forest types in Dongling Mountain,Beijing,North China,including six monodominant communities dominated by Juglans mandshurica,Populus cathayana,Betula dahurica,Betula platyphylla,Pinus tabuliformis and Larix gmelinii ***-rupprechtii and one codominant community dominated by Fraxinus rhynchophylla,Quercus mongolica and Tilia *** results showed that there were considerable differences in the litter decomposition rate(k-rate)among the different forest *** community weighted mean(CWM)traits of green leaves and litter quality explained 35.60%and 9.05%of the k-rate variations,respectively,and the interpretation rate of their interaction was 23.37%,indicating that the CWM traits and their interaction with litter quality are the main factors affecting the k-rate *** the recommended daily allowance,leaf nitrogen content,leaf dry matter content,leaf tannin content and specific leaf area were the main factors affecting the k-rate ***,we suggest that future studies should focus on the effects of the CWM traits of green leaves on litter decomposition at the community level.

关键词： Dongling Mountain of Beijing warm temperate forest ecosystem controlling factors of leaf litter decomposition community-weighted mean traits plant functional traits litter quality

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Effects of Robinia pseudoacacia on the undergrowth of herbaceous plants and soil properties in the Loess Plateau of China

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Journal of Plant Ecology 2021年第5期14卷 896-910页

作者： Qian Guo Zhongming Wen Cheng Zheng Wei Li Yongming Fan Duoju Zhu College of Grassland Agriculture Northwest A&F UniversityYangling 712100China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water ConversionNorthwest A&F UniversityYangling 712100China

Aims The introduction of Robinia pseudoacacia(RP)has some effects on undergrowth herbaceous plants(UH),soil properties and their relationships,which may be related to the vegetation ***,few studies have tested effects of RP on UH and soil over a large-scale area of the Loess *** The study area consisted of three vegetation zones(the steppe,forest-steppe and forest zone).Two canopy plant types were selected:RP stands and adjacent native *** measured five leaf functional traits:leaf carbon content(LC),leaf nitrogen content(LN),leaf phosphorus content(LP),specific leaf area(SLA)and leaf tissue density(LTD).The functional diversity,species diversity and community-weighted mean(CWM)traits were *** Findings(i)***,*** and *** increased significantly,whereas *** and *** decreased significantly in the three vegetation zones,compared with the native communities.(ii)Species diversity,functional diversity and community biomass decreased in the steppe zone,increased in the forest zone,and did not differ significantly in the forest-steppe zone.(iii)We found only soil organic carbon(P<0.05)and soil total nitrogen(P<0.05)in the forest zone decreased significantly compared with the native plots.(iv)The relationship between UH and soil properties was affected by RP and the vegetation ***,the effect of RP on UH and soil properties was associated with the vegetation *** result is of great significance to the planning of restoration and reconstruction of artificial forests in the Loess Plateau.

关键词： community-weighted mean traits functional diversity Robinia pseudoacacia species diversity Yanhe river basin

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