Interactive effects of understory removal and fertilization on soil respiration in subtropical Eucalyptus plantations

被引：22

作者：

Wan, Songze ^{[1
,2
]}

Zhang, Chenlu ^{[3
]}

Chen, Yuanqi ^{[1
,2
]}

Zhao, Jie ^{[4
]}

Zhu, Xiaolin ^{[1
,2
]}

Wu, Jianping ^{[5
]}

Zhou, Lixia ^{[1
]}

Lin, Yongbiao ^{[1
]}

Liu, Zhanfeng ^{[1
]}

Fu, Shenglei ^{[1
]}

机构：

[1] Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Guangzhou 510650, Guangdong, Peoples R China

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

[3] Henan Univ, Coll Life Sci, Key Lab Plant Stress Biol, Kaifeng City 475004, Henan, Peoples R China

[4] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China

[5] Nanchang Inst Technol, Inst Ecol & Environm Sci, Nanchang 330099, Peoples R China

来源：

JOURNAL OF PLANT ECOLOGY | 2015年 / 8卷 / 03期

基金：

美国国家科学基金会;

关键词：

understory removal; fertilization; interactive effects; soil respiration; subtropical plantation; FINE-ROOT PRODUCTION; NITROGEN-FERTILIZATION; CARBON-DIOXIDE; SEMIARID GRASSLAND; MICROBIAL BIOMASS; PINE PLANTATIONS; TROPICAL FOREST; CO2; EFFLUX; RESPONSES; VEGETATION;

D O I：

10.1093/jpe/rtu013

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Aims It has been well recognized that understory vegetation plays an important role in driving forest ecosystem processes and functioning. In subtropical plantation forests, understory removal and fertilization have been widely applied; however, our understanding on how understory removal affects soil respiration and how the process is regulated by fertilization is limited. Here, we conducted an understory removal experiment combined with fertilization to evaluate the effects of the two forest management practices and their interactions on soil respiration in subtropical forest in southern China. Methods The study was conducted in a split-plot design with fertilization as the whole-plot factor, understory removal as the subplot factor and block as the random factor in subtropical Eucalyptus plantations. In total, there were four treatments: control with unfertilized and intact understory (CK), understory removal but without fertilization (UR), with fertilization but without understory removal (FT) and with fertilization + understory removal (FT + UR). Eucalyptus above-and belowground biomass increment, fine root biomass, soil temperature, soil moisture and soil respiration were measured in the present study. Understory respiration (RU) was quantified in different ways: R-u = R-CK - R-UR or R-u = R-FT - R(FT + UR); fertilization increased soil respiration (RFI) was also quantified in different ways: R-FI = R-FT - R-CK or R-FI = R(FT + UR) - R-UR. Important Findings Over a 2-year experiment, our data indicate that understory removal significantly decreased soil respiration, while fertilization increased soil respiration. Understory removal decreased soil respiration by 28.8% under fertilization, but only 15.2% without fertilization. Fertilization significantly increased soil respiration by 23.6% with the presence of understory vegetation, and only increased by 3.7% when understory was removed, indicating that fertilization increased soil respiration mainly by increasing the contribution of the understory. Our study advances our understanding of the interactive effects of understory management and fertilization on soil respiration in subtropical plantations.

引用

页码：284 / 290

页数：7

共 48 条

[41] Soil CO2 efflux and root respiration at three sites in a mixed pine and spruce forest:: seasonal and diurnal variation [J].