科尔沁沙地赤松和樟子松根系生物量分配与构型特征

研究以同龄（40 a）樟子松为对照,在生长指标测定基础上,采用分层分段全挖法采集根系,对沙地赤松不同径级根生物量分配规律进行研究,测定根长、连接数量、平均连接长度等指标,同时计算分形维数和分形丰度。结果表明:与樟子松相比,沙地赤松具有较大生长量和生物量,其根生物量显著高于樟子松，细根（直径≤0.2 cm）生物量更显著高于樟子松，细根生物量在总生物量中的占比也是沙地赤松高。从根系垂直分布看,沙地赤松细根分布更深。沙地赤松根系分形维数是樟子松的1.2倍，分形丰度是樟子松的1.3倍;与樟子松相比,沙地赤松根系具有较强的吸收能力,能够利用较大范围的深层水分和养分,根系分支多,拓扑结构更加复杂。This study took 40-year-old *Pinus sylvestris var. mongolica* (Mongolian pine) as the control. Based on the measurement of growth-related indicators, root systems were collected using the stratified and segmented full excavation method, and the root biomass allocation patterns of *Pinus densiflora var. sylvestriformis* (sandy land red pine) at different root diameter classes were investigated. Indicators including root length, number of root connections, and average connection length were measured, while fractal dimension and fractal abundance were simultaneously calculated. The results indicated that compared with the control, *Pinus densiflora var. sylvestriformis* exhibited greater growth and total biomass, with its total root biomass being significantly higher than that of the control. Specifically, the biomass of fine roots (diameter ≤ 0.2 cm) was even more significantly elevated, and the proportion of fine root biomass in total plant biomass was also higher in this species. In terms of vertical root distribution, the fine roots of *Pinus densiflora var. sylvestriformis* were distributed at greater depths. The fractal dimension of its root system was 1.2 times that of the control, while the fractal abundance was 1.3 times that of the control. Compared with the control, the root system of *Pinus densiflora var. sylvestriformis* possessed stronger nutrient and water absorption capacity, enabling it to utilize a larger range of deep soil water and nutrients, with more root branches and a more complex topological structure.

搜集汇总

背景与挑战

背景概述

该数据集研究了科尔沁沙地中赤松与樟子松的根系特征，通过对比40年树龄的樟子松，分析了赤松的根系生物量分配、细根生物量占比及垂直分布。结果表明，沙地赤松在生长量、生物量、细根生物量和分布深度方面均显著高于樟子松，且根系构型更复杂，分形维数和分形丰度更高，表明其具有较强的水分和养分吸收能力。