退化沙质草地恢复过程中植被生物量变化及其与土壤碳的关系

doi:10.13866/j.azr.2023.09.09

Abstract

Abstract:

The allocation pattern of plant biomass and its input into the soil are key processes for restoring degraded sandy grassland, especially regarding soil carbon accumulation. In this study, mobile dunes, semifixed dunes, fixed dunes, and fenced grasslands in Horqin Sandy Land at different restoration stages were investigated. By analyzing the biomass allocation of herbaceous vegetation, root traits, soil physicochemical properties, and their interrelations, it was found that the aboveground biomass, root biomass, surface litter, and underground necromass all increased significantly (P<0.05) with the extent of desertified grassland restoration. Compared to severely desertified mobile dunes, the total dry matter (biomass+litters) in semifixed dunes, fixed dunes, and fenced grasslands increased by 11.01%, 116.29%, and 151.18%, respectively. Similar to the changes in biomass, soil carbon content also increased significantly (P<0.05) with the extent of desertified grassland restoration, with a higher increase rate observed in the 0-10 cm layer than the 10-20 cm layer. Structural equation modeling indicated that the soil carbon content in the 0-10 cm layer was influenced by the surface litter mass, underground necromass, and root surface area. Conversely, soil carbon content in the 10-20 cm layer was affected only by underground necromass and root surface area. Moreover, the soil carbon content in both layers showed an insignificant relationship with aboveground biomass. In conclusion, the soil carbon content in degraded sandy grassland is primarily affected by litter input and root traits but has an insignificant relationship with aboveground biomass.

Key words: degraded sandy grassland, soil carbon content, plant biomass, litter, root traits

ZHOU Jing,SUN Yongfeng,DING Jieping,BAI Haojiang,MA Xiang,WANG Xuyang,Luo Yongqing. Changes in vegetation biomass and its relationship with soil carbon during restoration processes in degraded sandy grasslands[J].Arid Zone Research, 2023, 40(9): 1457-1464.

Figures/Tables 7

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Tab. 1

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References 33

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类型	样点数量	植被盖度/%	主要物种
流动沙丘	70	5~15	黄柳（Salix gordejevii），差不嘎蒿（Artemisia halodendron），小叶锦鸡儿（Caragana microphylla），沙米（Agriophyllum squarrosum），狗尾草（Setaria viridis）
半固定沙丘	50	30~50	差不嘎蒿（Artemisia halodendron），小叶锦鸡儿（Caragana microphylla），大果虫实（Corispermum maorocarpum）、猪毛菜（Salsola collina）、五星蒿（Bassia dasyphylla）
固定沙丘	31	50~75	小叶锦鸡儿（Caragana microphylla），糙隐子草（Cleistogenes squarrosa）、白草（Pennisetum centrasiaticum），黄蒿（Artemisia scoparia）
封育草地	14	60~80	兴安胡枝子（Lespedeza daurica），白草（Pennisetum centrasiaticum），糙隐子草（Cleistogenes squarrosa），黄蒿（Artemisia scoparia），鹅绒委陵菜（Potentilla anserina），扁蓿豆（Melissitus ruthenicus），蒺藜（Tribulus terresters）、牻牛儿苗（Erodium stephanianum）

	流动沙丘（n=70）	半固定沙丘（n=50）	固定沙丘（n=31）	封育草地（n=14）
地表凋落物	21.51±2.90a	14.61±2.15b	67.08±12.75c	99.20±16.68d
地下残体	240.74±24.41a	247.27±28.66a	487.85±53.05b	494.73±57.74c
总凋落物	262.25±26.69a	261.89±29.12a	546.55±60.58b	593.92±67.84c
根系生物量	31.83±2.85a	36.77±4.09a	54.64±8.10b	94.26±16.39b
地上生物量	49.90±5.09a	83.19±5.29b	142.82±10.00c	175.84±14.35d
总生物量	81.73±5.85a	119.96±6.85a	197.46±13.89b	270.10±19.32c
总干物质	343.98±29.71a	381.84±32.69a	744.00±68.19b	864.03±74.88c

土壤深度/cm	土壤碳含量/（g·kg^-1）
土壤深度/cm	流动沙丘（n=70）	半固定沙丘（n=50）	固定沙丘（n=31）	封育草地（n=14）
0~10	1.50±0.14aA	2.00±0.22bA	2.43±0.36cA	6.59±0.43dA
10~20	1.08±0.09aB	1.26±0.11aB	2.37±0.32bB	3.33±0.38cB

Changes in vegetation biomass and its relationship with soil carbon during restoration processes in degraded sandy grasslands

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