Soil and vegetation successional responses in natural restoration of mixed Potentilla parvifolia-Salix cupularis shrubland in the Eastern Qilian Mountains

doi:10.11686/cyxb2020280

Abstract

Abstract:

This research aimed to scientifically evaluate the characteristics of natural succession and provide a theoretical basis for planning ecological restoration and sustainable utilization of shrub meadow. Differences in carbon storage and soil nutrient status were measured for a ‘time series’ of sites at different successional stages in mixed Potentilla parvifolia-Salix cupularis shrub meadow in the Eastern Qilian Mountains. For a prolonged natural restorative succession of about 20 years， it was found that the carbon storage of shrub communities increased by 1.1 to 3.8 times and the respiration rate of soil between shrubs increased by 1.1 to 2.0 times， while soil respiration under shrubs remained unchanged. The soil water content of the 0-30 cm soil layer under shrubs of shrub decreased by up to one third and the soil bulk density under shrubs increased in the 0-30 cm soil depth. Soil organic matter levels in the 0-30 cm soil layer displayed a single-peak curve with an initial increase of 2.0% to 48.7% and then a decrease of 4.4% to 32.0% in soil organic matter， available nitrogen and available phosphorus， while levels of total phosphorus and total potassium increased by 3.0% to 76.0%. No consistent pattern over time was detected for levels of other soil nutrients. To summarize， the carbon storage increased， but the physical and chemical properties of soil were negatively affected over the course of restorative succession of shrub meadow vegetation. Therefore， it is suggested that for sustainable and balanced development of grassland ecosystems there will be a need for proactive exploration of ways to achieve efficiency， so that the shrubs and herbs can develop positive plant community interaction and grow harmoniously. In this way the goal of stabilizing and balancing the ecosystem could be achieved and the production capacity of grass and the economic income of farmers and herdsmen increased.

Key words: Eastern Qilian Mountains, restoration succession, soil nutrient contents, carbon storage

Xiang HE, Mei-mei BAI, Chang-lin XU, Mei-juan SONG, Peng-bin WANG, Xiao-jun YU. Soil and vegetation successional responses in natural restoration of mixed Potentilla parvifolia-Salix cupularis shrubland in the Eastern Qilian Mountains[J]. Acta Prataculturae Sinica, 2021, 30(8): 12-24.

Figures/Tables 12

Table 1 The basic situations of research plots

植被恢复演替阶段 Vegetation recovery stage	地理坐标 Geographic coordinates	海拔 Altitude （m）	盖度 Coverage （%）	高度 Height （cm）	冠幅 Crown width （cm×cm）	地上生物量Aboveground biomass （g·m^-2）
未恢复期 No recovery stages （NR）	37°15′9.31″ N 102°34′45.18″ E	3348	<20	<45	<45×55	<460
恢复初期 Initial stages of restoration （IR）	37°14′54.37″ N 102°34′51.52″ E	3338	21~30	46~90	46×56~95×105	461~800
恢复中期 Middle stages of restoration （MR）	37°15′5.28″ N 102°34′47.38″ E	3344	31~40	91~135	96×106~145×155	801~1200
恢复后期 Late stages of restoration （LR）	37°14′59.54″ N 102°34′50.43″ E	3341	>40	>135	>145×155	>1200

Fig.1 Dynamic changes in the carbon storage of P. parvifolia+S. cupularis shrubland

Fig.2 Dynamic changes in the soil respiration of P. parvifolia+S. cupularis shrubland

Fig.3 Dynamic changes in the soil water contents of P. parvifolia+S. cupularis shrubland

Fig.4 Dynamic changes in the soil bulk density of P. parvifolia+S. cupularis shrubland

Fig.5 Dynamic changes in the soil organic matter of P. parvifolia+S. cupularis shrubland

Fig.6 Dynamic changes in the soil total nitrogen of P. parvifolia+S. cupularis shrubland

Fig.7 Dynamic changes in the soil available nitrogen of P. parvifolia+S. cupularis shrubland

Fig.8 Dynamic changes in the soil total phosphorus of P. parvifolia+S. cupularis shrubland

Fig.9 Dynamic changes in the soil available phosphorus of P. parvifolia+S. cupularis shrubland

Fig.10 Dynamic changes in the soil total potassium of P. parvifolia+S. cupularis shrubland

Fig.11 Dynamic changes in the soil available potassium of P. parvifolia+S. cupularis shrubland

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