Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Soil Science submitted time 2023-05-30 Cooperative journals: 《干旱区研究》
Abstract： This study was established to evaluate the influence of the Jilantai Salt Lake protection system on soil nutrient accumulation. This is a comparative study of soil nutrient accumulation in different protection system types under the salt lake protection system (zones for fixing shifting sand, fencing dunes for grass recovery, preventing wind and stopping sand, and a forest for protecting the salt lake) using the method of representative investigation and laboratory analysis. The goal was to provide a theoretical basis for the management of shelter forest in Jilantai Salt Lake. Our results showed the following: (1) The increases in soil organic carbon (SOC), total nitrogen (TN), total phosphorus (TP), available nitrogen (AN), and available phosphorus (AP) contents were in the range of 0.45-1.92 g·kg-1, 0.03-0.58 g·kg-1, 0.15-0.43 g·kg-1, 1.33-13.31 mg·kg-1, and 0.12-12.94 mg· kg-1, respectively. Soil depth, protection system type, and their interaction had significant positive effects on the increase in the soil SOC, TN, TP, and AP contents. (2) Establishment of the salt lake protection system had a significant effect on soil nutrients at a depth of approximately 0-100 cm, and the soil depth, protection system type, and their interaction had a significant impact on soil TP relative interaction intense (RIITP), AN relative interaction intense (RIIAN), AP relative interaction intense (RIIAP), and total RII. (3) Nutrient restoration index showed that soil nutrients improved to different degrees in different protection system types of the salt lake protection system, and their nutrient restoration indexes of zones for fixing shifting sand, fencing dunes for grass recovery, preventing wind and stopping sand and a forest for protecting the salt lake were 7.83%, 37.72%, 185.12%, and 252.36%, respectively. This study showed that, in the 38 years since its establishment, the salt lake protection system could effectively promote soil nutrient accumulation and accelerate soil nutrient restoration in the salt lake area, benefitting the ecological restoration and reconstruction around Jilantai Salt Lake.
Subjects: Environmental Sciences, Resource Sciences >> Other Disciplines of Environmental Sciences, Resource Sciences submitted time 2021-03-02 Cooperative journals: 《干旱区研究》
Abstract：为揭示机械沙障抗拉力学特性，优选合适的阻沙固沙材料，利用TY8000系列伺服控制机对试验对象进行纵向拉伸试验。结果表明：当孔隙度为均一型（全疏型或全密型）时，不同材料沙障的试样宽度与抗拉力均呈幂函数正相关，与抗拉强度呈幂函数负相关，其抗拉力与伸长量变化曲线均为单峰曲线；当材料相同时，不同孔隙度沙障的试样宽度与抗拉力均呈幂函数正相关，与抗拉强度呈幂函数负相关，其抗拉力与伸长量变化曲线类型不同，即均一型沙障的抗拉力均为单峰曲线，而混合型（上疏下密型）沙障则为双峰曲线；当试样宽度大于4 cm时，上疏下密伸长量>全密型伸长量>全疏型伸长量，其大小分别为(141.23±2.56)、(103.46±3.20)mm和(63.50±1.20)mm；在测定过程中，试样宽度大的实测值小于试样宽度小的实测值，由于实际过程中局部丝网受力不均所致，出现了“颈缩”现象。建议在野外布设时多使用上疏下密型沙障，并根据当地的实际风况，首先应对沙障材料进行室内抗拉力学特性的预实验，避免由经验化引起的铺设问题，以达到防风固沙效益的最大化。
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