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| Relationship between understory vegetation and soil moisture in different forest types in Datong, Qinghai province |
| WANG Li1, LIN Sha1, LI Yuanhang1, CHEN Mengfei1, HE Kangning1, TONG Guoyan2 |
1. School of Soil and Water Conservation, Beijing Forestry University, Key Laboratory of State Forestry Administration on Soil and Water Conservation, Engineering Research Center of Forestry Ecological Engineering of Ministry of Education, 100083, Beijing, China;
2. Datong County Experimental Forest Farm, 810100, Datong, Qinghai, China |
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Abstract [Background] This work is to explore the characteristics of soil water and understory vegetation and their relationship with each other in typical deforestation forests in the alpine region of Qinghai.[Methods] The three typical plantations of Picea crasslia forest, Larix principis-rupprechtii forest and Sabina przewalskii forest in Datong county of Qinghai province were selected as research objects, and the original grassland was used as the control. The characteristics of understory vegetation and the soil moisture characteristics of 0-200 cm soil layer and their relationship with each other were studied through field investigation and laboratory experiments.[Results] 1) The soil moisture in the forest lands of the study area was relatively scarce, and the herbaceous plants under the forests were dominated with dry-land plants such as the Elymus dahuricus, Artemisia sacrorum, Poa annua, etc. The richness and diversity of herbs under the L. principis-rupprechtii forest was the best, followed by the P. crasslia forest. The vegetation characteristics of the S. przewalskii were similar to those of the grassland. 2) The average moisture content of different forest types and grassland was in descending order P. crasslia forest (23.79%), grassland (21.29%), S. przewalskii forest (19.02%), and L. principis-rupprechtii forest (16.93%). 3) For topsoil (0-20 cm), the water-holding capacity of forest land was better than that of barren grassland. In 20-60 cm soil layer, the water-holding ability of P. crasslia forest land was the best, and the water-holding capacity of L. principis-rupprechtii forest land was the worst. The effect of vegetation types on soil water-holding capacity increased with increasing soil depth. 4) There was a significantly positive correlation and negative correlation between the species diversity of understory vegetation and biomass and the soil moisture content of the forest(P<0.05), respectively. And the degree of mutual influence decreased with the increase of soil depth, but its effect was mainly concentrated on the soil moisture of 0-120 cm soil layer.[Conclusions] P. crasslia can be used as the main afforestation species for constructing water conservation forests; L. principis-rupprechtii can be used as the main forest tree species for constructing soil and water conservation forests in areas where soil moisture is relatively scarce; the vegetation characteristics of S. przewalskii are close to wild grassland, then S. przewalskii can effectively form a forest and grass composite structural system. L. principis-rupprechtii and S. przewalskii can be used as the main tree species for vegetation construction in the region, and the introduction of local species can be taken into account, thus accelerating the process of vegetation restoration, helping to maintain a virtuous cycle of ecosystems through afforestation and improving the ecosystem of the goal of the service function.
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Received: 17 January 2019
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