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Analysis of the consequences of land-use changes and soil types on organic carbon storage in the Tarim River Basin from 2000 to 2020
Agriculture, Ecosystems & Environment ( IF 6.6 ) Pub Date : 2021-12-17 , DOI: 10.1016/j.agee.2021.107824
Wenwen Li 1 , Shengnan Jia 1 , Wei He 1 , Sajjad Raza 1 , Kazem Zamanian 1, 2 , Xiaoning Zhao 1
Affiliation  

With fast development of industry and agriculture in last two decades, land use changed greatly on specific soil types of intrinsic low quality with C loss potential and necessitates avoiding. Although researchers studied the effect of land-use changes on soil carbon storage, that on some soil types had rarely been reported, which led to relatively more C loss. We explored the impact of land-use changes and soil types on soil organic carbon (SOC) sequestration in the top 30 cm in the Tarim River Basin (the second largest inland river in the world) from 2000 to 2020. The land-use images with a one-kilometer spatial resolution and soil data from the Harmonized World Soil Database were analysed. The groundwater levels were monitored by 11 wells along the river from 2012 to 2017. Land-use changes were dominated by increases in the areas of cultivated land (1843–4099 km2) and woodland (5055–5433 km2) and decreases in grassland area ( 19076–12634 km2). The increase in cultivated land area was acquired from grassland (54%), woodland (32%) and unused land (14%), which was dominated by Phaeozems, Solonchaks and Fluvisols (84%). The converted land use to woodland was dominated by Fluvisols, Phaeozems, Arenosols and Solonchaks (98%). The converted land use from grassland to other land-use types was dominated by Arenosols, Fluvisols and Phaeozems (85%). The SOC was reduced by 9.83 Tg (+8.04 in cultivated land, +0.06 in woodland, −17.93 in grassland). The SOC stock change efficiency (SOCE kg C m−2) was SOC change divided by area change. The increase in SOC (Tg) of cultivated land was 5.04 from grassland (SOCE 3.76) and 2.9 from woodland (SOCE 3.68). The SOC of woodland increased by 8.66 Tg at cost of losing grassland (SOCE 3.35). Moreover, land-use changes affected local ecological environment. The cultivated land along the river increased 298 km2, and the desertification advanced towards oasis by decreasing 950 km2 of grassland in transition zone. The average groundwater table increased in the upstream (−3.12 to −2.33 m) and midstream regions (−1.84 to −1.71 m) monthly from 2012 to 2017 and in the downstream region (−7 to −2.84 m) annually from 2009 to 2017. This was attributed to expanded cultivated land and salt-washing cultivation on Solonchaks. In conclusion, the land-use conversion from grassland to woodland and cultivated land, mainly for Fluvisols, Phaeozems and Solonchaks, caused negative SOC storage, especially in riverbanks and oasis-desert transition zones facing climate change.



中文翻译:

2000-2020年塔里木河流域土地利用变化和土壤类型对有机碳储量的影响分析

近二十年来,随着工农业的快速发展,在具有潜在碳损失潜力的特定土壤类​​型上,土地利用发生了巨大变化,需要避免。虽然研究人员研究了土地利用变化对土壤碳储量的影响,但在某些土壤类型上的研究很少被报道,这导致了相对更多的碳损失。我们探讨了 2000 年至 2020 年土地利用变化和土壤类型对塔里木河流域(世界第二大内河)前 30 厘米土壤有机碳 (SOC) 固存的影响。土地利用图像以一公里的空间分辨率和来自协调世界土壤数据库的土壤数据进行了分析。2012 年至 2017 年,沿河的 11 口井监测了地下水位。2 ) 和林地 (5055–5433 km 2 ) 和草地面积减少 (19076–12634 km 2 )。耕地面积的增加来自草地(54%)、林地(32%)和未利用地(14%),其中以褐藻土、Solonchaks和Fluvisols(84%)为主。转化为林地的土地用途主要是 Fluvisols、Phaeozems、Arenosols 和 Solonchaks (98%)。从草地转换为其他土地利用类型的土地利用以沙土土、流水土和褐土(85%)为主。SOC 降低了 9.83 Tg(耕地+8.04,林地+0.06,草地-17.93)。SOC 库变化效率(SOCE kg C m -2) 是 SOC 变化除以面积变化。耕地的 SOC (Tg) 增加来自草地 (SOCE 3.76) 的 5.04 和来自林地 (SOCE 3.68) 的 2.9。以失去草地为代价,林地的 SOC 增加了 8.66 Tg(SOCE 3.35)。此外,土地利用的变化影响了当地的生态环境。沿江耕地增加298 km 2,荒漠化向绿洲减少950 km 2 。过渡带草原。上游(-3.12至-2.33 m)和中游地区(-1.84至-1.71 m)的平均地下水位从2012年到2017年每月增加,下游地区(-7到-2.84 m)从2009年到2017年每年增加. 这要归功于Solonchaks 的耕地扩大和盐洗耕作。综上所述,从草地向林地和耕地的土地利用转换,主要是河土、风土和索隆查克斯,造成了负的 SOC 储存,特别是在面临气候变化的河岸和绿洲 - 沙漠过渡区。

更新日期:2021-12-17
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