Inner Mongolia Agricultural University, Hohhot, China.
Inner Mongolia Autonomous Region Water Conservancy Development Center, Hohhot, China.
PeerJ. 2023 Jan 27;11:e14819. doi: 10.7717/peerj.14819. eCollection 2023.
To solve the withering of plantation in the feldspathic sandstone areas of Inner Mongolia and to promote the regeneration, rejuvenation, and sustainability of forests.
We stumped aging trees at the ground heights of 0, 10, 15, and 20 cm (S1, S2, S3, and S4, respectively) and utilized unstumped trees as the control (CK). We then analyzed the effects of the different stump heights on the roots and the root microenvironment of and the relationship between the roots and the root microenvironment in the stumped .
The root fractal features, root branching rate, root length, root soluble proteins, soil moisture content, and soil nutrients among the different treatments were ranked as S3>S2>S1>S4>CK ( < 0.05). The root topological index, root proline, and malondialdehyde among the different treatments were ranked as S3<S2<S1<S4<CK ( < 0.05). The topological indices of S1, S2, S3, S4, and CK were 0.80, 0.86, 0.89, 0.94, and 0.98, respectively, and all were near 1. This result indicated a typical fishtail-shaped branching structure. The root length and root fractal dimensions were primarily affected by the positive correlation of the soil moisture content and the soil organic matter, and the root topological index was primarily affected by the negative correlation of the root proline. Root nutrients were dominant in the changes in the root architecture, while soil moisture and nutrients played supporting roles. These results indicated that stumping can promote plant root growth and root nutrient accumulation, thereby improving soil moisture and the soil nutrient distribution, and the S3 treatment had the greatest impact on the roots and root microenvironment. Therefore, the 15 cm stump height treatment should be implemented for withering in feldspathic sandstone areas to promote vegetation restoration.
为了解决内蒙古长石砂岩区人工林衰退问题，促进森林的更新、复壮和可持续性。
我们在离地 0、10、15 和 20 厘米处（分别为 S1、S2、S3 和 S4）砍伐了老龄树木，并将未砍伐的树木作为对照（CK）。然后分析了不同的砍伐高度对根和根微环境的影响，以及根和根微环境之间的关系。
不同处理的根分形特征、根分枝率、根长、根可溶性蛋白、土壤含水量和土壤养分的顺序为 S3>S2>S1>S4>CK（<0.05）。不同处理的根拓扑指数、根脯氨酸和丙二醛的顺序为 S3<S2<S1<S4<CK（<0.05）。S1、S2、S3、S4 和 CK 的拓扑指数分别为 0.80、0.86、0.89、0.94 和 0.98，均接近 1，这表明具有典型的鱼尾形分支结构。根长和根分形维数主要受土壤含水量和土壤有机质的正相关影响，根拓扑指数主要受根脯氨酸的负相关影响。根养分在根结构变化中占主导地位，而土壤水分和养分起支持作用。这些结果表明，砍伐可以促进植物根系生长和根养分积累，从而改善土壤水分和土壤养分分布，S3 处理对树木根系和根微环境的影响最大。因此，在长石砂岩区应采用 15cm 的砍伐高度来处理树木的衰退，以促进植被恢复。
