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Soil C, N, and P stoichiometry is often used to reveal soil C, N, and P Balance and interaction
.
Decoupled nutrient stoichiometry not only causes nutrient restriction, but also inhibits plant growth and microbial activity
.
Nutrient stoichiometry showed great variation
under different ecosystem types.
Gravel is widely distributed worldwide, especially in
mountain ecosystems.
The presence of gravel promotes the formation of large pores on the surface of gravel-gravel and gravel-fine soil, which affects soil hydrological processes, including increasing water infiltration, reducing surface runoff and soil erosion
.
In addition, gravel acts as a potential source of nutrients in the soil, and its weathering process releases effective nutrients
.
However, the current understanding of soil nutrient stoichiometry in rocky areas is unclear, there are great differences in the influence of gravel content on soil nutrients, and there is a lack of stoichiometric regulation and mechanism study
of soil nutrient stoichiometry by gravel gradient.
Therefore, the study of soil nutrient stoichiometry on the change of gravel content in dry valleys not only improves the understanding of nutrient stoichiometry in rocky areas, but also contributes to agricultural production and ecological restoration
in the region.
Under the climate background of the arid valley in the upper reaches of the Minjiang River, the research group of ecological restoration and biodiversity conservation of the Chengdu Institute of Biology, Chinese Academy of Sciences carried out field control experiments of four gravel content (V V-1) gradients, and selected four native species, Artemisia pilophyllum (Artemisia pilophyllum).
Artemisia vestita), Bauhinia brachycarpa, Sichuan Huangqi (Cotinus).
szechuanensis) and Sophora davidii and blank control were used as vegetation treatments, and 0-10 cm, 10-20 were determined and analyzed under different treatments cm, 20-30 cm and 30-40 cm soil layers C, N, P The variation trend of its measurement ratio explores the differences in nutrient status under different native species, and reveals the effects and mechanisms
of gravel content and vegetation treatment on nutrient stoichiometry.
The study found that soils C, N, P, C:N, C:P and N:P were found to be soils under all vegetation treatments Both decrease with the increase of gravel content, but their downward trend is not exactly the same
between soil layers.
Compared with no plants, the soil N content under the treatment of Acanthus and A.
albicana increased by 13.
8% and 14.
8%, respectively, making its C:N lower than that of
Artemisia tricholas and A.
chinena and A.
chinesa treatments 。 Soil nutrient and metering ratios were positively correlated with soil moisture and capillary porosity, and negatively correlated
with soil bulk density and non-capillary porosity.
This study found that soil structure, moisture, and vegetation are the main drivers influencing soil stoichiometry
.
Gravel content mainly indirectly regulates soil nutrient stoichiometry
by affecting soil physical properties and plant growth.
The research was jointly funded by the National Natural Science Foundation of China (No.
32271654) and the National Science and Technology Basic Resources Special Program (2019FY202300), and was mainly completed
by Huang Long, Hu Hui, Bao Weikai and Li Fanglan.
Some of the results were recently published in Catena under the title "Shifting soil nutrient stoichiometry with soil of variable rock fragment contents and different vegetation types.
"
。
Original link
Figure 1 Graphic summary
