Effects of sand burial disturbance on establishment of three desert shrub species in the margin of oasis in northwestern China
Effects of sand burial disturbance on establishment of three desert shrub species in the margin of oasis in northwestern China
复制标题
沙埋干扰对西北绿洲边缘3种荒漠灌木生存的影响
DOI：
10.1111/1440-1703.1269
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发表时间：
2019-01-01
影响因子：
2
通讯作者：
Gou, Qianqian
中科院分区：
文献类型：
--
作者：
Wang, Guohua;Yu, Kailiang;Gou, Qianqian
沙埋是沙丘生态系统中一种重要的环境干扰，它决定着种子的萌发、植物的定植和植物的适合度。但沙埋对沙生灌木幼苗建植的重要性却很少有人探讨。以沙拐枣、白刺和梭梭3种优势沙生灌木（沙拐枣、白刺和梭梭）为试材，研究了不同深度（0、1、2、3、4和5 cm）沙埋对沙拐枣幼苗出苗、生长和存活率的影响。结果表明，浅埋能提高建植初期的出苗率和幼苗成活率。最佳埋深分别为2、4和5cm。ammodendron、N. sphaerocarpa和C. mongolicum，分别;这种差异的最佳埋藏深度可以解释观察到的减少再生H。与其他两个物种相比，Ammodendron。超过最佳深度，我们发现，沙埋防止出苗的H。ammodendron和N.球果属通过增加幼苗生物量分配到吹碎茎中，只有一小部分幼苗可以从深埋深度中出苗。出苗后深沙埋可促进出苗后幼苗的生长，提高幼苗活力，促进成苗。我们认为，沙埋可能会影响植物再生，并可能导致物种组成的转变。选择适宜的生态系统恢复树种，需要考虑其种子萌发和植物建群/更新对沙埋干扰的适应能力。
Sand burial is an important environmental disturbance which determines seed germination, plant establishment, and plant fitness in sand dune ecosystems. But the critical importance of sand burial for seedling establishment of desert shrubs is rarely explored. We investigated the effects of sand burial at different regimes (0, 1, 2, 3, 4 and 5 cm, the main depths of soil seed bank) on the seedling emergence, growth and survival rate of three dominant desert shrubs (Calligonum mongolicum, Nitraria sphaerocarpa and Haloxylon ammodendron) for ecosystem restoration in sand dunes of northwestern China. The results indicated that shallow burial improved the seedling emergence and the subsequent seedling survival rate for the initial establishment period. The optimal burial depths were 2, 4 and 5 cm for H. ammodendron, N. sphaerocarpa and C. mongolicum, respectively; this difference in optimal burial depth may account for observed decreased regeneration of H. ammodendron as compared to the other two species. Beyond the optimal depths, we found that sand burial prevented seedling emergence for H. ammodendron and N. sphaerocarpa. Only a small proportion of seedlings can emerged from deep burial depth by increasing seedling biomass allocation to blow-ground stem. However, after emergence deep sand burial stimulated growth rate of emerged seedlings, increased the seedling vigor and promoted the seedling establishment. We suggest that sand burial could affect plant regeneration and potentially leaded to shift in species composition. Choice of suitable species for ecosystem restoration needs to account for its ability in term of seed germination and plant establishment/regeneration to adapt to disturbance of sand burial.