Budget of Plant Litter and Litter Carbon in the Subalpine Forest Streams
Budget of Plant Litter and Litter Carbon in the Subalpine Forest Streams
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DOI：
10.3390/f12121764
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发表时间：
2021-12
期刊：
影响因子：
2.9
通讯作者：
Jia-Hui Hou;Fei Li;Zhihui Wang;Xuqing Li;Wanqin Yang
中科院分区：
文献类型：
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作者：
Jia-Hui Hou;Fei Li;Zhihui Wang;Xuqing Li;Wanqin Yang
调查森林溪流中植物凋落物和凋落物碳的收支，可以为理解陆地-水生生态系统的生物地球化学联系和管理森林集水区提供关键的科学依据。为了解山地森林、河岸植被和水生生态系统之间的生态地球化学联系，以长江上游亚高山针叶林流域为研究对象，研究了不同河流特征和关键期下的凋落物输入和输出的变化。在为期一年的调查中，15条溪流的年凋落物输入量为20.14 g m−2，范围为2.47至103.13 g m−2。与此同时，输入河流的凋落物碳为8.61 mg m−2，范围为0.11至40.57 mg m−2。凋落物年产量在0.02 ~ 22.30 g m−2之间，平均为0.56 g m−2。相应地，凋落物碳输出量在0.01 ~ 1.51 mg m−2之间变化，平均值为0.16 mg m−2。凋落物碳输入输出比平均为270.01。最大值和最小值分别出现在生长季后期和融雪季。此外，温度的季节性变化，以及流的长度，占主导地位的输入流的凋落物和凋落物碳，而降水，温度，水位和沉积物的深度在很大程度上决定了他们的输出。简而言之，凋落物和凋落物碳的季节动态主要由流特征和降水以及温度模式。
Investigations on the budget of plant litter and litter carbon in forest streams can provide a key scientific basis for understanding the biogeochemical linkages of terrestrial–aquatic ecosystems and managing forest catchments. To understand the biogeochemical linkages among mountain forests, riparian vegetation, and aquatic ecosystems, the changes in litter input and output from the subalpine streams with stream characteristics and critical periods were investigated in an ecologically important subalpine coniferous forest catchment in the upper reaches of the Yangtze River. The annual litter input to the stream was 20.14 g m−2 and ranged from 2.47 to 103.13 g m−2 for 15 streams during the one-year investigation. Simultaneously, the litter carbon input to the stream was 8.61 mg m−2 and ranged from 0.11 to 40.57 mg m−2. Meanwhile, the annual litter output varied from 0.02 to 22.30 g m−2, and the average value was 0.56 g m−2. Correspondingly, the litter carbon output varied from 0.01 to 1.51 mg m−2, and the average value was 0.16 mg m−2. Furthermore, the average ratio of litter carbon input to output was 270.01. The maximum and minimum values were observed in the late growing season and the snowmelt season, respectively. Additionally, seasonal variations in temperature, together with the stream length, dominated the input of litter and litter carbon to the stream, while the precipitation, temperature, water level, and sediment depth largely determined their output. Briefly, the seasonal dynamics of litter and litter carbon were dominated by stream characteristics and precipitation as well as temperature patterns.