Bedrock and climate jointly control the phosphorus status of subtropical forests along two elevational gradients

被引:17
|
作者
He, Xianjin [1 ,2 ,3 ]
Chu, Chengjin [2 ,3 ]
Yang, Yongchuan [1 ]
Shu, Zufei [4 ]
Li, Buhang [2 ,3 ]
Hou, Enqing [5 ,6 ]
机构
[1] Chongqing Univ, Key Lab Three Gorges Reservoir Reg Ecoenvironm, Minist Educ, Chongqing 400045, Peoples R China
[2] Sun Yat Sen Univ, State Key Lab Biocontrol, Dept Ecol, Guangzhou 510275, Peoples R China
[3] Sun Yat Sen Univ, Sch Life Sci, Guangzhou 510275, Peoples R China
[4] Guangdong Chebaling Natl Nat Reserve, Shaoguan 512500, Peoples R China
[5] No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA
[6] Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Guangzhou, Peoples R China
基金
中国国家自然科学基金; 中国博士后科学基金;
关键词
Parent material; Altitude; Subtropical forest; Climate change; Mountain; SOIL MICROBIAL BIOMASS; LUQUILLO MOUNTAINS; CO2; FERTILIZATION; PARENT MATERIAL; NITROGEN; ECOSYSTEM; MECHANISMS; LIMITATION; AVAILABILITY; PHOSPHATE;
D O I
10.1016/j.catena.2021.105525
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Terrestrial carbon sequestration is constrained by the supply of soil phosphorus (P). Climate and bedrock are two key independent drivers of soil P supply. Their potential interactions with soil P supply remains poorly understood. To address this issue, we examined the P status of subtropical forests in southern China along two adjacent elevational gradients with contrasting bedrock types (granite vs. slate). The results show that the P concentration of granite was significantly lower than that of slate. Accordingly, the P concentration of mineral soil, litter, and fine-root P on the granite was significantly lower than that on the slate. In contrast, their ratios to the bedrock P concentration were higher in the granite transect than in the slate transect. Moreover, we found a stronger nutrient uplift effect on P in the P-poor transects. Although bedrock P concentrations were constant along elevation, topsoil total P, soil labile inorganic P (Pi), soil labile organic P (Po), and soil moderately labile Pi concentrations showed a significant increasing trend with elevation on both transects. Multivariate linear regression models revealed that bedrock P explained more variation of plant and soil P than did climate. Soil moderately labile Po concentration showed contrasting elevational patterns on different bedrock types, which indicated an interactive effect between bedrock P concentration and climate on the soil moderately labile Po concentration. The Pearson correlation analysis indicated that plant and soil P measures were more tightly coupled in the P-poor transect than in the P-rich transect. These results indicate that the P status of subtropical forests is determined predominantly by the bedrock P concentration and by its interaction with climate. Our results suggest that predictions of ecosystem P status and its responses to climate change can be improved significantly by incorporating local-scale parent material properties into the modeling frameworks.
引用
收藏
页数:10
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