相关实验视频
Updated: Jan 14, 2026

07:11
Sampling Soils in a Heterogeneous Research Plot
Published on: January 7, 2019
35.8K
[不同种群密度的Robinia pseudoacacia种植园中的土壤总体稳定性和土壤营养含量]
Rui Liu1, Teng-Yan Zhao1, Shu-Min Ma1
1College of Forestry, Shanxi Agricultural University, Jinzhong 030801, Shanxi, China.
Ying yong sheng tai xue bao = The journal of applied ecology
|January 12, 2026
概括
下罗比尼亚 pseudoacacia 树密度提高了土壤结构和营养含量. 最佳密度 (800-1100植物·hm-2) 提高了土壤总体的稳定性,这对森林生产力和碳捕获至关重要.
科学领域:
- 林业和土壤科学 林业和土壤科学
- 生态生态学 生态生态学
- 环境科学 环境科学
背景情况:
- 树密度是森林结构,功能,生产力和生态系统服务的关键决定因素.
- 森林群密度显著影响土壤特性,包括土壤结构和营养循环.
- 了解Robinia pseudoacacia种植密度对土壤的影响对于可持续森林管理至关重要.
研究的目的:
- 为了研究不同*Robinia pseudoacacia*种群密度对土壤聚合物的稳定性和营养含量的影响.
- 为了确定在 *Robinia pseudoacacia* 种植园中保持土壤结构完整性和营养状况的最佳种群密度.
主要方法:
- 在西省吉县研究了 *Robinia pseudoacacia* 种植园 (800-2300 种·hm-2) 的五种密度梯度.
- 分析了表土 (0-10厘米) 和地下 (10-20厘米) 层中的土壤聚合物组成和营养特征.
- 测量的宏积分比例,平均重量直径 (MWD),几何平均直径 (GMD),碎形尺寸 (D),总 (TN),有机碳 (SOC) 和总 (TP).
主要成果:
- 种群密度增加导致土壤聚合物稳定性下降 (较低的宏聚合物比例,MWD,GMD) 和营养含量 (TN,SOC).
- 与地下土壤相比,地表土壤的MWD,GMD,TN,TP和SOC显著更高.
- 0.25-1毫米的聚合物大小部分显示了最高的TN,TP和SOC含量.
结论:
- 种群密度对 *Robinia pseudoacacia * 种植园中的土壤总体稳定性和营养动态有重大影响.
- 较低的种群密度,特别是800-1100种植物·hm-2,是保持土壤结构稳定性和促进碳和固化的最佳选择.
- 保持适当的种群密度对于增强森林生态系统功能和长期生产力至关重要.
相关概念视频
Moisture Content and Bulking of Aggregate
410
The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
When aggregates are exposed to rain or sit in stockpiles, they absorb moisture, which must be...
410
Bulk Density of Aggregate
1.1K
Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
Most natural mineral aggregates, like sand and gravel,...
Most natural mineral aggregates, like sand and gravel,...
1.1K
Porosity and Absorption of Aggregate
732
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
732
Specific Gravity of Aggregate
763
Aggregates typically contain pores, which can be either permeable or impermeable. Considering the pores in the aggregates, the specific gravity of aggregates is defined in three different forms, namely, bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity.
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
Bulk or gross specific gravity is calculated by taking the ratio of the mass of aggregates in the saturated surface-dry state to the total volume that includes both the solids and the voids within the...
763
Key Elements for Plant Nutrition
23.9K
Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
23.9K
The Soil Ecosystem
24.4K
Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
24.4K

