Contrasting effects of nitrogen and phosphorus addition on soil respiration in an alpine grassland on the Qinghai-Tibetan Plateau

被引：53

作者：

Ren, Fei ^{[1
,2
]}

Yang, Xiaoxia ^{[1
,3
,4
]}

Zhou, Huakun ^{[1
]}

Zhu, Wenyan ^{[1
]}

Zhang, Zhenhua ^{[1
]}

Chen, Litong ^{[1
]}

Cao, Guangmin ^{[1
]}

He, Jin-Sheng ^{[1
,5
,6
]}

机构：

[1] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Adaptat & Evolut Plateau Biota, 23 Xinning Rd, Xining 810008, Peoples R China

[2] Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China

[3] Qinghai Univ, State Key Lab Plateau Ecol & Agr, 251 Ningda Rd, Xining 810016, Peoples R China

[4] Qinghai Acad Anim & Vet Sci, 1 Weier Rd, Xining 810016, Peoples R China

[5] Peking Univ, Coll Urban & Environm Sci, Dept Ecol, 5 Yiheyuan Rd, Beijing 100871, Peoples R China

[6] Peking Univ, Key Lab Earth Surface Proc, Minist Educ, 5 Yiheyuan Rd, Beijing 100871, Peoples R China

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

关键词：

MICROBIAL BIOMASS; ELEVATED CO2; CARBON; FOREST; RESPONSES; FERTILIZATION; COMPONENTS; WATER; TEMPERATURE; MINERALIZATION;

D O I：

10.1038/srep34786

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

High soil organic carbon content, extensive root biomass, and low nutrient availability make alpine grasslands an important ecosystem for assessing the influence of nutrient enrichment on soil respiration (SR). We conducted a four-year (2009-2012) field experiment in an alpine grassland on the Qinghai-Tibetan Plateau to examine the individual and combined effects of nitrogen (N, 100 kg ha(-1)year(-1)) and phosphorus (P, 50 kg ha(-1)year(-1)) addition on SR. We found that both N and P addition did not affect the overall growing-season SR but effects varied by year: with N addition SR increased in the first year but decreased during the last two years. However, while P addition did not affect SR during the first two years, SR increased during the last two years. No interactive effects of N and P addition were observed, and both N addition and P addition reduced heterotrophic respiration during the last year of the experiment. N and P addition affected SR via different processes: N mainly affected heterotrophic respiration, whereas P largely influenced autotrophic respiration. Our results highlight the divergent effects of N and P addition on SR and address the important potential of P enrichment for regulating SR and the carbon balance in alpine grasslands.

引用

页数：10

共 58 条

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