College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, People's Republic of China; Department of Agroforestry & Environmental Science, Sylhet Agricultural University, Sylhet, 3100, Bangladesh.
Open School, Bangladesh Open University, Gazipur, 1705, Dhaka, Bangladesh.
Environ Res. 2022 Mar;204(Pt A):111921. doi: 10.1016/j.envres.2021.111921. Epub 2021 Aug 26.
Ecological restoration of coal mine degraded soils across arid and semi-arid environments worldwide remains particularly challenging. We used a combination of greenhouse and field experiments to assess the potential role of a woody species, Ulmus pumila, in the restoration of degraded soils associated with coal-mining activities in the northwest China. We investigated how various combinations of water-nitrogen-phosphorus (W-N-P) resources affect multiple growth parameters in U. pumila. We found that several plant growth traits significantly improved with W-N applications, regardless of P inputs. Moderate-to-highest W-N-P doses increased net photosynthesis and transpiration rates, water use efficiency, stomatal conductance, chlorophyll and carotenoid contents under greenhouse conditions. A combination of high W together with low N-P applications led to high relative water content and net photosynthetic rates under field conditions. Increasing of N-P doses under W-shortage condition, aided U. pumila to enhance osmotic adjustments by increasing contents of proline and soluble sugar and also boost the activity of superoxide dismutase, peroxidase and catalase in leaf tissues to reduce accumulation of reactive oxygen species and malondialdehyde content in all conditions of greenhouse and field. Our study is the first to assess the optimum W-N-P resources in U. pumila and demonstrate that optimum growth performance could be obtained under W supplements corresponding to 90 mm year, N and P at 110 and 45 kg ha, respectively, under field condition. These findings can have far reaching implications for vegetation restoration of degraded areas associated with coal-mining activities across arid and semi-arid regions worldwide.
全世界干旱和半干旱地区煤矿退化土壤的生态恢复仍然极具挑战性。我们采用温室和田间实验相结合的方法，评估了一种木本植物榆树（Ulmus pumila）在中国西北地区煤矿活动相关退化土壤恢复中的潜在作用。我们研究了不同水-氮-磷（W-N-P）资源组合如何影响榆树的多个生长参数。我们发现，无论磷的输入如何，W-N 的应用都显著改善了几种植物生长特性。中等到最高剂量的 W-N-P 处理增加了净光合速率和蒸腾速率、水分利用效率、气孔导度、叶绿素和类胡萝卜素含量，这是在温室条件下的结果。在田间条件下，高 W 与低 N-P 处理相结合导致相对较高的水含量和净光合速率。在 W 短缺条件下增加 N-P 剂量，通过增加脯氨酸和可溶性糖的含量来帮助榆树进行渗透调节，同时还能提高叶片组织中超氧化物歧化酶、过氧化物酶和过氧化氢酶的活性，以减少活性氧物质的积累和丙二醛含量，所有温室和田间条件下都是如此。本研究首次评估了榆树的最佳 W-N-P 资源，并表明在田间条件下，当 W 补充量相当于 90mm 年，N 和 P 分别为 110 和 45kg/ha 时，可以获得最佳的生长表现。这些发现对全世界干旱和半干旱地区与煤矿活动相关的退化地区的植被恢复具有深远意义。
