Divergent biomass partitioning to aboveground and belowground across forests in China

被引:14
|
作者
Sun, Jian [1 ]
Niu, Shuli [1 ]
Wang, Jinniu [2 ,3 ]
机构
[1] Chinese Acad Sci, Synth Res Ctr Chinese Ecosyst Res Network, Key Lab Ecosyst Network Observat & Modelling, Inst Geog Sci & Nat Resources Res, 11 Datun Rd, Beijing 100101, Peoples R China
[2] Chinese Acad Sci, Key Lab Mt Ecol Restorat & Bioresource Utilizat &, Key Lab Sichuan Prov, Chengdu Inst Biol, 9 Renminnanlu Rd, Chengdu 640019, Sichuan, Peoples R China
[3] Int Ctr Integrated Mt Dev ICIMOD, GPO Box 3226, Kathmandu, Nepal
基金
中国国家自然科学基金;
关键词
biomass partitioning; isometric partitioning; BGB; AGB ratio; environmental factors; climatic zone; Chinese forest; NET PRIMARY PRODUCTIVITY; ROOT-SHOOT ALLOCATION; ENVIRONMENTAL-FACTORS; ALPINE GRASSLAND; GLOBAL PATTERNS; PLANT; SOIL; TREE; VEGETATION; INVENTORY;
D O I
10.1093/jpe/rtx021
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Belowground to aboveground biomass (BGB/AGB) ratio is a highly valued parameter of the terrestrial carbon cycle and productivity. However, it remains far from clear whether plant biomass partitioning to aboveground and belowground is isometric (equal partitioning) or allometric (unequal partitioning) at community levels and what factors are necessary in order to regulate the partitioning. This study aimed to comprehensively find out the patterns of biomass partitioning and their regulatory factors across forests in China. The data of AGB and BGB were compiled from 1542 samples for communities across forests in China. Standardized major axis regression was conducted to examine whether AGB and BGB were allocated isometrically or allometrically at a community level. Redundancy analysis was used to analyze the relationships of BGB/AGB ratio with climatic factors and soil properties. We found that the slopes of the relationship between logAGB and logBGB were not always comparable to 1.0 (isometric allocation) at community levels, including primary forest, secondary forest, and planted forest. Meanwhile, samples in clay, loam, and sand soil types also presented the same phenomenon. Furthermore, the radically different allocations of AGB and BGB were found in northern and southern China. Environmental factors totally explained 3.86% of the variations in the BGB/AGB ratio at the community level, which include the mean annual precipitation, mean annual temperature, potential water deficit index, soil carbon content, soil nitrogen content, soil clay, soil loam, soil sand, soil pH, and soil bulk density. In addition, the environmental factors also have effects on the BGB/AGB ratio in other categories. The patterns revealed in this study are helpful for better understanding biomass partitioning and spreading the carbon circle models.
引用
收藏
页码:484 / 492
页数:9
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