Simulated nitrogen deposition significantly suppresses the decomposition of forest litter in a natural evergreen broad-leaved forest in the Rainy Area of Western China

Zhou, Shixing; Huang, Congde; Han, Bo-han; Xiao, Yaonan; Jiandong, Tang; Xiang, Yang; Luo, Chao

doi:10.1007/s11104-017-3383-x

Cited by 35 publications

(40 citation statements)

References 51 publications

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“…N additions decreased the decomposition rate of M. wilsonii litter, but did not have an effect on C. acuminata litter. A previous study also reported that extremely high N additions inhibited litter decomposition rate in subtropical forests [14]. Knorr et al [4] concluded that ambient N deposition and N addition levels are two important factors regulating litter decomposition.…”

Section: Discussionmentioning

confidence: 92%

“…Similar to N release, the P pattern in decomposing litter is primarily regulated by litter C:P ratios [14,37]. The immobilization of litter P has been seen to occur when the C:P ratio is greater than 700 [38].…”

Section: Discussionmentioning

confidence: 99%

“…In N-deficient ecosystems, N addition generally stimulates the decomposition by increasing soil N availability or reducing the C:N litter ratios [11]. However, in N-sufficient sites, the added N often shows an inhibitory or neutral effect on litter decomposition and nutrients mineralization due to the saturation of soil N availability and the suppression of enzymic synthesis [12][13][14][15][16]. The response of litter decomposition to environmental changes may largely depend on the litter's initial nutrient conditions [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China

Zhuang

Liang

et al. 2020

Forests

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Litter decomposition plays a critical role in regulating biogeochemical cycles in terrestrial ecosystems and is profoundly impacted by increasing atmospheric nitrogen (N) deposition. Here, a N manipulation experiment was conducted to explore the effects of N additions (0 kg N ha−1 yr−1, 20 kg N ha−1 yr−1 and 40 kg N ha−1 yr−1) on decay rates and nutrients release of two contrasting species, the evergreen and nutrient-poor Michelia wilsonii and the deciduous and nutrient-rich Camptotheca acuminata, using a litterbag approach at the western edge of the Sichuan Basin of China. The decay rate and the mineralization of N and phosphorus (P) was faster in nutrient-rich C. acuminata litter than in nutrient-poor M. wilsonii litter, regardless of N regimes. N additions tended to decrease the decay constant (k value) in M. wilsonii litter, but had no effect on C. acuminata litter. N additions had no significant effects on carbon (C) release of both litter types. N additions showed negative effects on N and P release of M. wilsonii litter, particularly in the late decomposition stage. Moreover, for C. acuminata litter, N additions did not affect N release, but retarded P release in the late stage. N additions did not affect the C:N ratio in both litter types. However, N additions—especially high-N addition treatments—tended to reduce C:P and N:P ratios in both species. The effect of N addition on N and P remaining was stronger in M. wilsonii litter than in C. acuminata litter. The results of this study indicate that N additions retarded the nutrients release of two foliar litters. Thus, rising N deposition might favor the retention of N and P via litter decomposition in this specific area experiencing significant N deposition.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China

Zhuang

Liang

et al. 2020

Forests

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“…The study was conducted in a natural evergreen broadleaf forest at the Bi Feng Gorge Scenic Spot, Ya’an City, Sichuan Province (30°03’N, 102°59’E, 1,170 m above sea level, Fig 1 ). The region is located in a subtropical moist forest zone with a monsoon climate [ 18 , 20 , 21 ]. The mean annual precipitation is approximately 1700 mm (average from 1961 to 2011), with approximately 60% falling from July to September [ 37 ], and the mean annual temperature is 16.2°C (25.4°C in July and 6.1°C in January) [ 20 , 21 , 36 ].…”

Section: Methodsmentioning

confidence: 99%

“…It has been hypothesized that an increase in N concentration possibly increases soil respiration and microbial activity in N-limited forest ecosystems [ 18 , 27 , 30 , 35 ]. Moreover, we previously reported that the natural evergreen broadleaf forests in the rainy area of western China are N-rich forest ecosystems, and N deposition was found to significantly decrease litter decomposition [ 20 , 36 ]. Considering these findings, we hypothesized that simulated N deposition likely reduces soil respiration through the combined negative effects on plant and microbial activities in these N-rich subtropical forests, especially under conditions of high atmospheric N deposition.…”

Section: Introductionmentioning

confidence: 99%

Simulated nitrogen deposition significantly reduces soil respiration in an evergreen broadleaf forest in western China

et al. 2018

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Soil respiration is the second largest terrestrial carbon (C) flux; the responses of soil respiration to nitrogen (N) deposition have far-reaching influences on the global C cycle. N deposition has been documented to significantly affect soil respiration, but the results are conflicting. The response of soil respiration to N deposition gradients remains unclear, especially in ecosystems receiving increasing ambient N depositions. A field experiment was conducted in a natural evergreen broadleaf forest in western China from November 2013 to November 2015 to understand the effects of increasing N deposition on soil respiration. Four levels of N deposition were investigated: control (Ctr, without N added), low N (L, 50 kg N ha−1·a−1), medium N (M, 150 kg N ha−1·a−1), and high N (H, 300 kg N ha−1·a−1). The results show that (1) the mean soil respiration rates in the L, M, and H treatments were 9.13%, 15.8% (P < 0.05) and 22.57% (P < 0.05) lower than that in the Ctr treatment (1.56 ± 0.13 μmol·m−2·s−1), respectively; (2) soil respiration rates showed significant positive exponential and linear relationships with soil temperature and moisture (P < 0.01), respectively. Soil temperature is more important than soil moisture in controlling the soil respiration rate; (3) the Ctr, L, M, and H treatments yielded Q10 values of 2.98, 2.78, 2.65, and 2.63, respectively. N deposition decreased the temperature sensitivity of soil respiration; (4) simulated N deposition also significantly decreased the microbial biomass C and N, fine root biomass, pH and extractable dissolved organic C (P < 0.05). Overall, the results suggest that soil respiration declines in response to N deposition. The decrease in soil respiration caused by simulated N deposition may occur through decreasing the microbial biomass C and N, fine root biomass, pH and extractable dissolved organic C. Ongoing N deposition may have significant impacts on C cycles and increase C sequestration with the increase in global temperature in evergreen broadleaf forests.

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Nitrogen and phosphorus co-addition stimulates soil respiration in a subtropical evergreen broad-leaved forest

et al. 2020

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Simulated nitrogen deposition significantly suppresses the decomposition of forest litter in a natural evergreen broad-leaved forest in the Rainy Area of Western China

Cited by 35 publications

References 51 publications

Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China

Nitrogen Additions Retard Nutrient Release from Two Contrasting Foliar Litters in a Subtropical Forest, Southwest China

Simulated nitrogen deposition significantly reduces soil respiration in an evergreen broadleaf forest in western China

Nitrogen and phosphorus co-addition stimulates soil respiration in a subtropical evergreen broad-leaved forest

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