Effects of terracing on root distribution of Pinus tabulaeformis Carr. forest and soil properties in the Loess Plateau of China.
Effects of terracing on root distribution of Pinus tabulaeformis Carr. forest and soil properties in the Loess Plateau of China.
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DOI：
10.1016/j.scitotenv.2020.137506
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发表时间：
2020-02
期刊：
影响因子：
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通讯作者：
Yulin Qi;Wei Wei-Wei;Junran Li;Cungen Chen;Yuanyuan Huang
中科院分区：
文献类型：
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作者：
Yulin Qi;Wei Wei-Wei;Junran Li;Cungen Chen;Yuanyuan Huang
梯田化是黄土丘陵沟壑区及类似地区改善土壤抗蚀性和支持植物生长的最有效的生态工程措施之一。研究了黄土高原不同梯田根系垂直分布特征及其与土壤环境因子的关系。利用探地雷达和土壤取样方法，研究了油松（Pinus tabulaeformis Carr.）0-400 cm土壤垂直根系分布、细根分布与0-160 cm土壤水分、土壤养分（土壤有机碳、全氮和全磷）和土壤抗蚀性的关系。在2018年的生长季节，三种梯田类型下的森林。我们在这里强调几个关键的发现。首先，水平台阶的根系密度最高（18.14 kg m-2），其次是鱼鳞坑（13.95 kg m-2）和反坡梯田（9.84 kg m-2），以及最高的土壤含水量、养分和土壤稳定性。其次，梯田化使根系分布差异显著（P< 0.05），导致土壤水分、养分、抗蚀力变异（解释变异80%以上），降低了土壤水分和养分的空间异质性。3种梯田细根密度参数均在0-40 cm土层达到最大值，随土层深度的增加而减小（P< 0.05）。细根有利于改善土壤水分状况、促进土壤养分积累和稳定土壤，而粗根密度过高则会消耗土壤养分，降低土壤抗蚀性。因此，水平梯段是一种较好的人工种植园梯田措施。tabulaeformisCarr.，在黄土高原等干旱半干旱地区生态系统恢复过程中实现土壤改良和固定。
Terracing is one of the most effective ecological engineering practices that improve soil anti-erosivity properties and support plant growth in the dryland loess hilly area and other similar regions. The objective of the study was to understand the vertical distribution of root in different terraces and their relationships with soil environmental factors in the Loess Plateau of China. The vertical root distribution in the 0–400 cm soil profile, fine root distribution and soil moisture, soil nutrients (soil organic carbon, total nitrogen, and total phosphorus) and soil anti-erosivity in 0–160 cm soil profiles (every 20 cm for one layer) were investigated using the ground-penetrating radar and soil coring methods in aPinus tabulaeformisCarr. forest under three terrace types during the growing season of 2018. We highlight several key findings here. First, level benches had the highest root density (18.14 kg m−2), followed by fish-scale pits (13.95 kg m−2) and reverse-slope terraces (9.84 kg m−2), as well as the highest soil water content, nutrients and soil stability. Second, terracing caused significant differences in root distribution (P< 0.05), leading to the variation of soil moisture, nutrients, anti-erosivity (explained over 80% variation) and reduced spatial heterogeneities of soil water content and nutrients. Third, fine root density parameters attained the highest values in the topsoil (0–40 cm soil layer) and decreased with increasing soil depth in all the three terrace types (P< 0.05). Finally, fine roots contributed to soil water improvement, nutrient promotion and soil stabilization, while higher density of coarse roots might consume soil nutrients and reduce soil anti-erosivity. We thus suggest that level benches could be a more suitable terracing measure for plantation ofP. tabulaeformisCarr., and to achieve soil melioration and fixation during the ecosystem restoration process in the Loess Plateau and other arid and semiarid regions.