Hydrologic-induced concentrated soil nutrients and improved plant growth increased carbon storage in a floodplain wetland over wet-dry alternating zones

被引：21

作者：

Zhang, Quanjun ^{[1
,3
]}

Wang, Zhaosheng ^{[1
]}

Xia, Shaoxia ^{[1
]}

Zhang, Guangshuai ^{[2
]}

Li, Suxiao ^{[1
]}

Yu, Dingkun ^{[4
]}

Yu, Xiubo ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China

[2] Natl Marine Environm Monitoring Ctr, Dalian 116023, Peoples R China

[3] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[4] Jiangxi Poyang Lake Natl Nat Reserve Author, Nanchang 330038, Jiangxi, Peoples R China

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2022年 / 822卷

基金：

中国国家自然科学基金;

关键词：

Wetland hydrological gradient; Soil nutrients; Plant community biomass; Carbon storage; Structural equation model; FRESH-WATER WETLANDS; SPECIES RICHNESS; NITROGEN; CLIMATE; SEQUESTRATION; GRASSLANDS; GRADIENT; RETENTION; IMPACTS;

D O I：

10.1016/j.scitotenv.2022.153512

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Hydrological gradient variations in wetlands have a vital impact on wetland carbon storage. However, the mechanisms by which hydrological gradient variations affect biomass and carbon storage by regulating the soil nutrient contents and plant diversity remain unclear. This study attempted to explore these influencing mechanisms by studying the relationships between hydrological gradient variations and carbon storage in wetlands. The results showed that the average nutrient content, plant biomass and soil carbon content values in the high frequency wet-dry alternating zones (HFWA, zones where the frequency of water level occurs between - 25 cm and 25 cm greater than 0.5) were 1.4 times, 2.3 times and 0.43 higher, respectively, than those in the low-frequency wet-dry alternating zones (LFWA, zones where the frequency of water level occurs between - 25 cm and 25 cm less than 0.3). These results indicated that the HFWA zones had higher soil nutrients, higher plant dominance, higher biomass and higher soil carbon contents than the LFWA zones. The structural equation model revealed a significant positive correlation between wet-dry alternations and the soil nutrient-plant biomass-soil carbon relation in wetlands. Moreover, there was also a significant positive correlation between wet-dry alternations and the plant dominance-plant biomass-soil carbon relation in wetlands. This implied that the concentrated effect of HFWA on soil nutrients promotes plant growth, enhances plant dominance, promotes plant productivity, and enhances the capacities of plants to input carbon to the soil, thereby increasing the soil carbon content. This study closely linked wetland hydrological gradients, plant biodiversity and wetland carbon sequestration and profoundly revealed the mechanisms by which hydrological gradients in wetlands reg-ulate the concentrations of nutrient elements, thereby affecting vegetation growth and carbon sequestration; these results could provide a new cognitive basis for understanding the coupling of carbon and water.

引用

页数：10