College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
National Positioning Observation and Research Station of Ecosystem in Mu Us Sandy Land, Yanchi 751500, Ningxia, China.
Ying Yong Sheng Tai Xue Bao. 2024 Jul 18;35(7):1753-1761. doi: 10.13287/j.1001-9332.202407.001.
Warming drives material cycling in terrestrial ecosystems by affecting litter decomposition, as it can alter litter yield, quality and decomposer composition and activity. The effect of warming on the decomposition of mixed litter in arid and semi-arid zones remains unknown. We investigated the mass loss and nutrient release dynamics during 450 days of decomposition of , , and their mixture in Mu Us Desert by open-top chambers and litter bags. The results showed interspecific differences in the responses to warming, in that warming promoted mass loss and N and P release from and inhibited mass loss and P but promoting N release from . Mixing of and litter inhibited decomposition. Warming enhanced the antagonistic effects of mixed decomposition. The total mass loss of mixed litter was decreased by 9%, and the release of N and P was decreased by 4.9% and 12.6%, respectively. The antagonistic effects of mixed litter mass loss and P release under the warming treatment gradually strengthened with time, with N release changing from a synergistic to an antagonistic effect at 150 d. The non-additive effects produced by the mixed decomposition of and litter were jointly regulated by temperature and time. Future research on mixed litter decomposition should consider the interaction between temperature and time.
升温通过影响凋落物分解来驱动陆地生态系统的物质循环，因为它可以改变凋落物的产量、质量以及分解者的组成和活性。升温对干旱和半干旱地区混合凋落物分解的影响尚不清楚。我们通过开顶式气室和凋落物袋研究了 450 天内毛乌素沙漠中 、 、及其混合物的质量损失和养分释放动态。结果表明，升温对不同物种的响应存在种间差异，即升温促进了 和 的质量损失以及 N 和 P 的释放，而抑制了 的质量损失和 P 的释放但促进了 N 的释放。 和 凋落物的混合抑制了分解。升温增强了混合分解的拮抗作用。混合凋落物的总质量损失减少了 9%，N 和 P 的释放分别减少了 4.9%和 12.6%。在升温处理下，混合凋落物质量损失和 P 释放的拮抗作用随着时间的推移逐渐增强，N 释放的作用从协同作用变为拮抗作用，在 150 天时发生变化。 和 凋落物混合分解产生的非加性效应受温度和时间的共同调节。未来混合凋落物分解的研究应考虑温度和时间的相互作用。
