Effects of meteorological factors on the litter decomposition of the fungal endophyte Stipa purpurea symbiont in alpine grassland
Received date: 2025-03-27
Revised date: 2025-04-15
Online published: 2025-08-13
Litter decomposition has an important role in the carbon and nutrient cycling of terrestrial ecosystems. Climatic conditions are the main factors involved in litter decomposition. Currently, few studies have examined litter decomposition in alpine grassland ecosystems. To determine the effects of meteorological factors on the litter decomposition and nutrient release processes under a climate change background, the Stipa purpurea endophytic fungal symbiont was used along with the litter decomposition bag method to analyze the decomposition characteristics with endophytic fungi (E+) and without endophytic fungi (E-). The effect of meteorological factors on the decomposition rate of Stipa purpurea was analyzed. The results indicated that the decomposition rate of E+ was higher compared with that of E-, whereas the decomposition cycle was shorter. With the extension of time, the total nitrogen content of Stipa purpurea showed an increasing trend, lignin content gradually changed from significantly higher in E+ to no significant difference between the two, and the cellulose content gradually changed from significantly lower in E+ compared with E- (P<0.05). Regardless of endophytic fungi, the litter weight and mass loss rate of Stipa purpurea were correlated with the mean monthly temperature and the mean ground temperature (P<0.05). Precipitation was positively correlated with the litter decomposition rate of Stipa purpurea, and the total nitrogen content of the litter was positively correlated with temperature and precipitation (P<0.05). The lignin and cellulose content were negatively correlated with temperature and precipitation. The duration of sunshine had a positive effect on the decomposition of litter, and the lignin, cellulose, and litter weight content were strongly correlated with sunshine duration. Overall, endophytic fungi accelerate the decomposition of Stipa purpurea litter. For E+ and E-, the effect of meteorological factors on the decomposition of Stipa purpurea litter was consistent.
GUO Qiang , WANG Yuqin , SONG Meiling . Effects of meteorological factors on the litter decomposition of the fungal endophyte Stipa purpurea symbiont in alpine grassland[J]. Arid Zone Research, 2025 , 42(7) : 1269 -1278 . DOI: 10.13866/j.azr.2025.07.10
表1 E+和E-紫花针茅凋落物Olson指数模型和分解速率Tab. 1 Olson exponential model and decomposition rate of E+ and E- Stipa purpurea litters |
| 凋落物 种类 | 回归方程 | 相关系 数(R2) | 分解速 率(k) | ||
|---|---|---|---|---|---|
| E+ | y=1.1024e-0.869t | 0.970 | 0.869 | 0.80 | 3.45 |
| E- | y=1.09698e-0.66t | 0.963 | 0.66 | 1.05 | 4.54 |
注: 为凋落物分解50%所需要的时间; 为凋落物分解95%所需要的时间。 |
表2 紫花针茅凋落物分解特征与气象因子的相关性分析Tab. 2 Correlation analysis of litter decomposition characteristics and meteorological factors of Stipa purpurea |
| 凋落物种类 | 指标 | 月平均 气温 | 降水量 | 月平均地 面温度 | 日照时数 |
|---|---|---|---|---|---|
| E+ | 凋落物重量 | -0.990** | -0.802 | -0.993** | 0.290 |
| 质量损失率 | 0.989** | 0.805 | 0.992** | -0.287 | |
| 全氮 | 0.872* | 0.915* | 0.856* | -0.502 | |
| 木质素 | -0.938** | -0.659 | -0.955** | 0.169 | |
| 纤维素 | -0.924** | -0.703 | -0.935** | 0.065 | |
| E- | 凋落物重量 | -0.995** | -0.831* | -0.992** | 0.369 |
| 质量损失率 | 0.993** | 0.835* | 0.989** | -0.367 | |
| 全氮 | 0.931** | 0.885* | 0.917* | -0.398 | |
| 木质素 | -0.894* | -0.640 | -0.910* | 0.033 | |
| 纤维素 | -0.913* | -0.710 | -0.921** | 0.063 |
注:*表示P<0.05;**表示P<0.01。 |
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