Wang Xu Yang, Li Yu Qiang, Luo Yong Qing, Lian Jie, Niu Ya Yi, Gong Xiang Wen, Yang Huan
Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Ying Yong Sheng Tai Xue Bao. 2018 May;29(5):1494-1502. doi: 10.13287/j.1001-9332.201805.005.
As one of the important pathways of material and energy flow between plant and soil system, litterfall plays a key role in the process of vegetation and soil restoration in ecologically fragile region. To explore the inter- and intra-annual dynamics of litter production and related regulatory factors at different habitats in sandy land ecosystem, we investigated the litter production during nine continuous growing seasons, while the air temperature and precipitation were measured over mobile dune, fixed dune, and grassland in Horqin Sandy Land. The results showed that annual litter production at different habitants were in the order of mobile dune (9.01 g·m) ＜ fixed dune (67.46 g·m) ＜ grassland (119.55 g·m). The inter-annual dynamics of litterfall fluctuated significantly, with a double-peak curve in fixed dune and "W" curve in grassland. The intra-annual variation of litterfall exhibited a "U" curve at all the three habitats, with peaks appearing in April and September, respectively. Precipitation and temperature had significant effects on the intra-annul dynamics of litterfall production in fixed sand dune and grassland, but had no significant effect on the inter-annual dynamics of litter production at three habitats. Temperature was the major factor affecting the dynamics of the litter fall during the growing season in Horqin Sandy Land.
作为植物与土壤系统间物质和能量流动的重要途径之一，凋落物在生态脆弱地区植被和土壤恢复过程中发挥着关键作用。为探究沙地生态系统不同生境下凋落物产量的年际和年内动态及相关调控因素，我们在科尔沁沙地的流动沙丘、固定沙丘和草地连续九个生长季调查了凋落物产量，同时测量了气温和降水量。结果表明，不同生境的年凋落物产量排序为：流动沙丘（9.01 g·m）＜固定沙丘（67.46 g·m）＜草地（119.55 g·m）。凋落物的年际动态波动显著，固定沙丘呈双峰曲线，草地呈“W”形曲线。在所有三个生境中，凋落物的年内变化均呈“U”形曲线，峰值分别出现在4月和9月。降水和温度对固定沙丘和草地凋落物产量的年内动态有显著影响，但对三个生境凋落物产量的年际动态无显著影响。温度是影响科尔沁沙地生长季凋落物动态的主要因素。
