Changes in litter quality induced by nutrient addition alter litter decomposition in an alpine meadow on the Qinghai-Tibet Plateau.
Changes in litter quality induced by nutrient addition alter litter decomposition in an alpine meadow on the Qinghai-Tibet Plateau.
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DOI：
10.1038/srep34290
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发表时间：
2016-10-03
影响因子：
4.6
通讯作者：
He JS
中科院分区：
文献类型：
--
作者：
Zhu W;Wang J;Zhang Z;Ren F;Chen L;He JS
氮、磷添加量对西藏高寒草甸凋落物分解的影响还不清楚。在一个析因的N × P添加试验的小区内收集凋落叶，并允许分解超过708天的未施肥小区，以确定N和/或P添加对凋落物分解的影响。结果表明，养分添加显著影响了4种植物凋落物的初始磷和磷相关生化特性。然而，凋落物氮和氮相关的生化特性的反应，养分添加是相当种特异性。凋落物C分解和N释放具有种特异性。而N、P添加量显著影响凋落物P的释放。半纤维素+纤维素与N、P的比值与凋落物C分解呈显著正相关，C：N比值是凋落物N释放的决定因素，C：P和（半纤维素+纤维素）：P控制凋落物P释放。总的来说，凋落物C的分解受不同植物种类凋落物质量的控制，并强烈影响P添加。增加氮的有效性可能会影响凋落物C的分解，更间接地通过改变植物物种组成比直接通过改善凋落物质量，并可能加速N和P循环，但转移到P限制的生态系统。
The effects of nitrogen (N) and phosphorus (P) addition on litter decomposition are poorly understood in Tibetan alpine meadows. Leaf litter was collected from plots within a factorial N × P addition experiment and allowed to decompose over 708 days in an unfertilized plot to determine the effects of N and/or P addition on litter decomposition. Results showed that nutrient addition significantly affected initial P and P-related biochemical properties of litter from all four species. However, the responses of litter N and N-related biochemical properties to nutrient addition were quite species-specific. Litter C decomposition and N release were species-specific. However, N and P addition significantly affected litter P release. Ratios of Hemicellulose + Cellulose to N and P were significantly related to litter C decomposition; C:N ratio was a determinant of litter N release; and C:P and (Hemicellulose + Cellulose):P controlled litter P release. Overall, litter C decomposition was controlled by litter quality of different plant species, and strongly affected by P addition. Increasing N availability is likely to affect litter C decomposition more indirectly by shifting plant species composition than directly by improving litter quality, and may accelerate N and P cycles, but shift the ecosystem to P limitation.
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影响因子：
64.8
作者：
Magnani, Federico;Mencuccini, Maurizio;Grace, John
通讯作者：
Grace, John
影响因子：
9.7
作者：
Manning, Peter;Saunders, Mark;Tscherko, Dagmar
通讯作者：
Tscherko, Dagmar
中国上空氮沉降增强
影响因子：
64.8
作者：
Liu, Xuejun;Zhang, Ying;Zhang, Fusuo
通讯作者：
Zhang, Fusuo
影响因子：
4.8
作者：
Aerts, R;De Caluwe, H;Beltman, B
通讯作者：
Beltman, B
影响因子：
3.7
作者：
Frey, SD;Knorr, M;Simpson, RT
通讯作者：
Simpson, RT