Links between plant diversity, carbon stocks and environmental factors along a successional gradient in a subalpine coniferous forest in Southwest China
Links between plant diversity, carbon stocks and environmental factors along a successional gradient in a subalpine coniferous forest in Southwest China
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DOI：
10.1016/j.foreco.2011.03.042
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发表时间：
2011-08
影响因子：
3.7
通讯作者：
Yuanbing Zhang;B. Duan;J. Xian;H. Korpelainen;Chunyang Li
中科院分区：
文献类型：
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作者：
Yuanbing Zhang;B. Duan;J. Xian;H. Korpelainen;Chunyang Li
在中国西南地区，共选择了48个经历了5 ~ 310年自然更新的亚高山针叶林样地作为研究地点。我们比较了6个植物群落的物种丰富度(S)、植物多样性（Shannon-Wiener指数，H’；Margalef指数，R）和地上、地下生态系统碳库(C)，并探讨了植物多样性与碳储量之间的功能关系。结果表明，地上碳含量显著增加（超过52倍），主要是由于地上活植物和地表凋落物中碳含量的增加。土壤有机碳（SOC）含量由草本群落类型（以德叶霞为主，P1）向混交林类型（以桦木为主）增加。和faxoniana冷杉（abies faxoniana, P4），构成了系统的主要C库（63-89%），但随后逐渐减少（群落P5-P6）。整个生态系统（树木、凋落物层和矿质土壤）的平均碳储量在105 ~ 730 Mg C ha - 1之间，在云杉林群落类型（以紫杉林（byPicea purpurea）为主，P6）中碳储量尤其高。另一方面，土壤、地上碳储量与年平均气温、海拔高度的关系总体较弱（P < 0.05）。此外，我们没有发现a与地上C储存量之间的关系，而我们发现h '与地上C储存量之间存在显著的负相关关系。根系总生物量和凋落物C/N是影响土壤有机碳的重要功能性状，而R和h′的影响较小。通径分析还发现，凋落物碳氮比主要通过微生物数量和土壤转化酶活性的变化来调节土壤有机碳含量。
In all, 48 sites of subalpine coniferous forest that had undergone natural regeneration for 5–310 years were selected as study locations in the Southwest China. We compared species richness (S), plant diversity (Shannon–Wiener index,H′; Margalef index,R), and above- and below-ground ecosystem carbon (C) pools of six plant communities along a chronosequence of vegetation restoration, and we also examined evidence for a functional relationship between plant diversity and C storage. Our results showed that above-ground C increased significantly (over 52-fold), mainly due to the increase of C in aboveground living plants and surface litter. Soil organic carbon (SOC) content increased from the herb community type (dominated byDeyeuxia scabrescens, P1) to mixed forest type (dominated byBetulaspp. andAbies faxoniana, P4), which constituted the main C pool of the system (63–89%), but decreased thereafter (communities P5–P6). The mean C stock in the whole ecosystem – trees, litter layer and mineral soil – ranged from 105 to 730 Mg C ha−1and was especially high in the spruce forest community type (dominated byPicea purpurea, P6). On the other hand, the relationships between C stocks (soil, aboveground) and mean annual temperature or altitude were generally weak (P> 0.05). Moreover, we did not detect a relationship betweenSand aboveground C storage, while we found a significant negative relationship betweenH′,Rand aboveground C storage. In addition, our experiment demonstrated that total root biomass and litter C/N ratio were significant functional traits influencing SOC, whileS,R, andH′had little effect. Path analysis also revealed that litter C/N ratio predominantly regulated SOC through changes in the quantity of microorganisms and soil invertase enzyme activity.