Warming and Nitrogen Application: Effects on Decomposition of Leaf Litter in the Less Khingan Mountains

doi:10.11924/j.issn.1000-6850.casb19010132

Abstract

Abstract:

The paper aims to study the response of leaf litter in the Lesser Khingan Mountains to temperature rise, nitrogen deposition and their interaction. We designed 4 kinds of treatments [nitrogen addition (LN), warming (WT), interaction of nitrogen addition and temperature increase (WLN) and control (CK)] by using the spatial shift method. The results showed that: (1) the effect of nitrogen deposition on leaf litter decomposition was first inhibition and then gradual promotion, and the inhibition was significant after the first year of freezing and thawing (P<0.05); (2) under the condition of temperature increase, the leaf litter decomposition of the first year’s growth season was significantly slowed down (by 13.8%) compared with the control, and the leaf litter decomposition of the second year’s growth season was significantly accelerated (by 9.4%); (3) the litter decomposition under the combined driving of nitrogen and temperature was consistent with the warming treatment, and both of them showed first inhibition and then promotion; (4) the mass loss rate and element release rate of each treatment were firstly inhibited and then promoted compared with the control, and the mass loss rate of leaf litter of different treatments was LN (55.2%)>WT (54.4%)>WLN (53.4%)>CK (53.2%). The study shows that the decomposition of leaf litter is initially inhibited by nitrogen application, temperature increase and interaction, and then accelerated, compared with Changbai Mountains, the decomposition of leaf litter in the Lesser Khingan Mountains is more sensitive to nitrogen addition.

Key words: litter decomposition, nitrogen deposition, warming, leaf litter, mass loss rate, release rate

CLC Number:

X171.1

Xu Meng, Wang Qinggui, Yan Guoyong, Xing Yajuan. Warming and Nitrogen Application: Effects on Decomposition of Leaf Litter in the Less Khingan Mountains[J]. Chinese Agricultural Science Bulletin, 2020, 36(14): 46-53.

Figures/Tables 8

References 39

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处理方式	初始质量	2年后剩余质量
CK	5.000±0.000A	2.34±0.35A
LN	5.000±0.000A	2.24±0.23A
WT	5.000±0.000A	2.28±0.13A
WLN	5.000±0.000A	2.33±0.19A

处理方式	初始质量	2年后剩余质量
CK	5.000±0.000A	2.34±0.35A
LN	5.000±0.000A	2.24±0.23A
WT	5.000±0.000A	2.28±0.13A
WLN	5.000±0.000A	2.33±0.19A