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

干旱区研究 ›› 2023, Vol. 40 ›› Issue (9): 1457-1464.doi: 10.13866/j.azr.2023.09.09

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

周静¹(),孙永峰²,丁杰萍¹,白浩江³,马祥⁴,王旭洋³,罗永清³()

1.甘肃省生态环境科学设计研究院，甘肃兰州 730020
2.中国市政工程西北设计研究院有限公司，甘肃兰州 730000
3.中国科学院西北生态环境资源研究院，甘肃兰州 730000
4.青海大学畜牧兽医科学院，青海西宁 810016

收稿日期:2023-03-11 修回日期:2023-05-23 出版日期:2023-09-15 发布日期:2023-09-28
通讯作者: 罗永清
作者简介:周静（1981-），女，副高级工程师，主要从事生态环境保护方面的研究. E-mail: fallzhouj@aliyun.com
基金资助:
国家自然科学基金项目(42242005);国家自然科学基金项目(31500369);甘肃省自然科学基金项目(23JRRA663);中国科学院青年创新促进会项目和中国科学院科技扶贫项目(E129050203)

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

ZHOU Jing¹(),SUN Yongfeng²,DING Jieping¹,BAI Haojiang³,MA Xiang⁴,WANG Xuyang³,Luo Yongqing³()

1. Gansu Academy of Eco-environmental Sciences, Lanzhou 730020, Gansu, China
2. CSCEC AECOM Consultants Co., Ltd., Lanzhou 730000, Gansu, China
3. Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China
4. Academy of Animal Science and Veterinary Medicine, Qinghai University, Xining 810016, Qinghai, China

Received:2023-03-11 Revised:2023-05-23 Online:2023-09-15 Published:2023-09-28
Contact: Yongqing Luo

摘要/Abstract

摘要：

植物生物量分配特征及其向土壤中的物质输入是退化沙质草地生态系统恢复，尤其是土壤碳含量增加的关键环节。本研究以科尔沁沙地不同恢复阶段的流动沙丘、半固定沙丘、固定沙丘和封育草地为研究对象，调查分析草本植被生物量分配特征、根系性状和土壤理化性质特征，厘清生物量分配特征和根系性状与土壤碳的相互关系。结果发现：随着沙化草地逐步恢复，植被地上生物量、根系生物量、地表凋落物以及地下残体均呈显著的增加趋势（P<0.01），相对于沙化严重的流动沙丘，半固定沙丘、固定沙丘和封育草地的植物总干物质（生物量+凋落物）分别增加了11.0%、116.3%和151.2%。与生物量变化趋势相同，土壤碳含量随沙化草地的逐步恢复显著增加（P<0.05），其中0~10 cm层的增加速率高于10~20 cm层。结构方程模型（SEM）分析显示，0~10 cm层土壤碳含量受地表凋落物、地下残体和根表面积3个因素的影响，10~20 cm层土壤碳含量仅受地下残体和根表面积两个因素的影响，同时，两层土壤碳含量均与地上生物量无显著的关系。研究结果表明，在退化沙质草地恢复过程中，土壤碳含量主要受凋落物输入以及根系性状的影响，而与地上生物量无直接关系。

关键词: 退化沙质草地, 土壤碳含量, 植物生物量, 凋落物, 根系性状

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

周静,孙永峰,丁杰萍,白浩江,马祥,王旭洋,罗永清. 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[J]. 干旱区研究, 2023, 40(9): 1457-1464.

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.

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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

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

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

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