[1]CHEN Xiaoxue,LI Hongli,DONG Zhi,et al.Characteristics of Soil Stoichiometry and Species Diversity of Community and Their Coupling Relationship in Coastal Saline-Alkali Land[J].Research of Soil and Water Conservation,2020,27(06):37-45,59.
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Characteristics of Soil Stoichiometry and Species Diversity of Community and Their Coupling Relationship in Coastal Saline-Alkali Land
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 06
Page number:
37-45,59
Column:
目次
Public date:
2020-10-20
- Title:
- Characteristics of Soil Stoichiometry and Species Diversity of Community and Their Coupling Relationship in Coastal Saline-Alkali Land
- Keywords:
- soil ecological stoichiometric characteristics; coupling relationship; species diversity; coastal saline-alkali land
- CLC:
- S153; S727.22
- DOI:
- -
- Abstract:
- In order to reveal the characteristics of soil stoichiometry and species diversity in coastal saline-alkali land forestland, five pure forests and four mixed forests in Shouguang mechanical forest farm of Shandong Province were selected as the research sites. Ecological stoichiometry was used to compare and analyze the difference of soil nutrient elements and change of species diversity among woodlands in the process of plantation. The CCA and RDA were used to explore the key factor on species diversity. The results show that:(1)the surface soil organic carbon(SOC)and total nitrogen(N)of 0—20 cm layer in different forestlands accounted for 41.76%～54.56% and 40.51%～51.46% of the whole section; there was no significant difference in total phosphorus(P)among all the forestland layers except upland Salix matsudana; there was no obvious stratification rule of total potassium(K)in 0—60 cm soil layer; surface soil organic carbon and total nitrogen can be used as the most sensitive fertility index in forestlands;(2)after afforestation, C/N in forestlands evolved from gradually decreasing to first increasing and then decreasing; the distribution characteristics of C/P, N/P and N/K present the decrease and then increase to gradual decrease; C/K and P/K are no significant change, but show the decreasing trend before and after afforestation; the nutrient content of saline-alkali soil is generally low, and total nitrogen and total phosphorus have different limits on coastal saline-alkali land; pure forests are more restricted by nitrogen and phosphorus nutrients;(3)soil nutrients in each forestland have a highly significant nonlinear coupling relationship with each other; SOC, N, P and K interact with each other, SOC, N and P interact with each other, and SOC and N show the positive correlation of synergistic growth;(4)the plant community can be roughly divided into three groups, among which the distribution of salt-tolerant plants is closely related to the availability of P; annual herb prefers the fertile soil, while perennial herb prefers the low-nutrient soil; there is a significant positive correlation between species diversity and soil K and C/N. In conclusion, the nutrient content of coastal saline-alkali forestland is generally low. The effects of Salix matsudana, Populus deltoides, Fraxinus chinensis-Ailanthus altissima and Gleditsia sinensis-Ailanthus altissima forest lands on soil fertility are both excellent, which can alleviate the soil barrenness of saline-alkali land. Afforestation can change the absorption, utilization and distribution of nutrients in different soil layers, and N and P have different degrees of restrictions on coastal saline-alkali land. Soil nutrients and ecostoichiometry in each forestland have a highly significant nonlinear coupling relationship with each other. And ecostoichiometry also affects the distribution and diversity of shrub and grass plants in saline alkali land.
- References:
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Last Update:
2020-10-20