Factors influencing the natural regeneration of the pioneering shrub Calligonum mongolicum in sand dune stabilization plantations in arid deserts of northwest China.
Factors influencing the natural regeneration of the pioneering shrub Calligonum mongolicum in sand dune stabilization plantations in arid deserts of northwest China.
复制标题
西北干旱荒漠沙丘稳定人工林先锋灌木沙拐枣自然更新的影响因素
DOI：
10.1002/ece3.3913
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发表时间：
2018-03
影响因子：
2.6
通讯作者：
Zhao C
中科院分区：
文献类型：
--
作者：
Fan B;McHugh AD;Guo S;Ma Q;Zhang J;Zhang X;Zhang W;Du J;Yu Q;Zhao C
沙拐枣是防治荒漠化的先锋灌木，在我国西北荒漠区植被恢复中得到广泛应用。为了揭示沙生沙地沙生沙地无性繁殖和有性繁殖天然更新的局限性，在固定沙丘的过程中，对固定沙丘和移动的沙丘的沙生沙地沙生沙地无性繁殖的萌芽、出苗、土壤种子库密度和土壤物理性质进行了研究。通过控制田间和盆栽试验，研究了不同土壤类型和埋深条件下的种子萌发和出苗情况。沙丘稳定后，蒙古栎成熟种群密度差异显著。移动的沙丘沙生固定沙丘和移动的沙丘3个土层的土壤种子库密度差异不显著，但固定沙丘的出苗率明显低于移动的沙丘。固定沙丘上没有发现蒙古栎的克隆繁殖，固定沙丘上也很少有蒙古栎幼苗建立。从移动的沙丘到固定沙丘，土壤粘粒和粉粒含量、充气孔隙度和土壤表面压实度发生了显著变化。蒙古栎出苗高度依赖于土壤物理条件。这些结果表明，土壤物理条件的变化限制了固定沙丘上蒙古栎的克隆繁殖和出苗。种子库密度不是沙生沙地沙生沙地天然更新的限制因子，但沙生沙地幼苗建库质量差限制了沙生沙地天然更新的进一步发展。因此，克隆繁殖可能是移动的沙丘种群扩展的最重要方式。蒙古栎是一种适应于移动的沙丘环境的先锋种，在固定沙丘人工林中难以自然生存。
Calligonum mongolicum is a successful pioneer shrub to combat desertification, which is widely used for vegetation restoration in the desert regions of northwest China. In order to reveal the limitations to natural regeneration of C. mongolicum by asexual and sexual reproduction, following the process of sand dune stabilization, we assessed clonal shoots, seedling emergence, soil seed bank density, and soil physical characteristics in mobile and stabilized sand dunes. Controlled field and pot experiments were also conducted to assess germination and seedling emergence in different dune soil types and seed burial depths. The population density of mature C. mongolicum was significantly different after sand dune stabilization. Juvenile density of C. mongolicm was much lower in stabilized sand dunes than mobile sand dune. There was no significant difference in soil seed bank density at three soil depths between mobile and stabilized sand dunes, while the emergence of seedlings in stabilized dunes was much lower than emergence in mobile dunes. There was no clonal propagation found in stabilized dunes, and very few C. mongolicum seedlings were established on stabilized sand dunes. Soil clay and silt content, air‐filled porosity, and soil surface compaction were significantly changed from mobile sand dune to stabilized dunes. Seedling emergence of C. mongolicm was highly dependent on soil physical condition. These results indicated that changes in soil physical condition limited clonal propagation and seedling emergence of C. mongolicum in stabilized sand dunes. Seed bank density was not a limiting factor; however, poor seedling establishment limited C. mongolicum's further natural regeneration in stabilized sand dunes. Therefore, clonal propagation may be the most important mode for population expansion in mobile sand dunes. As a pioneer species C. mongolicum is well adapted to propagate in mobile sand dune conditions, it appears unlikely to survive naturally in stabilized sand dune plantations.
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DOI：
10.1139/b04-163
发表时间：
2005-02-01
期刊：
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE
影响因子：
--
作者：
Dech, JP;Maun, MA
通讯作者：
Maun, MA
影响因子：
1.8
作者：
Boedeltje, G;Bakker, JP;ter Heerdt, GNJ
通讯作者：
ter Heerdt, GNJ
影响因子：
3
作者：
COFFIN, DP;LAUENROTH, WK
通讯作者：
LAUENROTH, WK
DOI：
10.2136/sssaj1994.03615995005800040010x
发表时间：
1994-07-01
影响因子：
2.9
作者：
FREIJER, JI
通讯作者：
FREIJER, JI
影响因子：
4.8
作者：
CHAMBERS, JC
通讯作者：
CHAMBERS, JC