Effect of farmland expansion on drought over the past century in Songnen Plain, Northeast China

Yu, Wanhui; Zhang, Lijuan; Zhang, Hongwen; Jiang, Lili; Zhang, Ankang; Pan, Tao

doi:10.1007/s11442-020-1736-5

Cited by 14 publications

(5 citation statements)

References 31 publications

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“…Uncertainty for soil matrix mainly resulted from soil texture, that is, less clay in soils was accompanied by more aggregate protection in broadleaved forests as compared to that in coniferous forest. In Northeast China, soil texture with more clay is mainly found in the central region of Songnen Plain (HLJTR-Editorial-Committee, 1992) (e.g., Dumeng site in this study) and is dominated by croplands and grasslands with limited forests (Yu et al, 2020). The forest-dominated regions (Daxinganling Mts., Xiaoxinganling Mts., and Changbai Mts.…”

Section: Uncertainty From Geo-climatic Conditions Soil Matrix Andmentioning

confidence: 88%

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

et al. 2020

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Differences in soil organic carbon (SOC) and total nitrogen (TN) between broadleaved and coniferous forests are not well-defined, hindering the evaluation of the influence of forest-type on land degradation and development. For these two foresttypes, we determined differences in soil aggregation, SOC, and TN by comparing 202 plots at six sites with 14 common afforestation tree species. Bulk soil was separated to macroaggregates (0.25-2 mm), microaggregates (0.053-0.25 mm), and silt and clay fractions (<0.053 mm). Inter-site variations were excluded by MANOVA (multiple analysis of variance) and MANCOVA (multiple analysis of covariance). Broadleaved forests exhibited 30-50% higher SOC and TN in bulk soils than that of coniferous forests, and aggregates contributed to 75-77% of the SOC and TN accrual. The high accrual was a result of SOC and TN concentration increases in aggregates (30-50%), macroaggregates fraction increases (50%, with a 14% decrease in the non-aggregate fractions), aggregates diameter increases (one-third), and non-significant differences in C/N. Uncertainty tests showed a low bias (4.2%), and the accrual of SOC and TN in broadleaved forests were larger at sites with less clay and at higher altitude and more precipitation and afforested with more fraxinus and less poplar. Our results highlight that SOC and TN accrual in broadleaved forests is mainly due to the stronger aggregates protection, which should be fully considered during precise land evaluation and species selection for afforestation. Future studies identifying the mechanisms underlying these changes should consider interactions among leaf functional traits, aggregation-disaggregation processes, and microbial rhizosphere deposition.

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Section: Uncertainty From Geo-climatic Conditions Soil Matrix Andmentioning

confidence: 88%

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

et al. 2020

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“…Due to the high concentration of grassland, animal husbandry is also very developed in the Songnen Plain. The climate of the Songnen Plain is a temperate monsoon climate with four distinct seasons, and it is a semi-humid and semi-arid zone [51]. The average annual temperature increases gradually from north to south, with a latitudinal distribution.…”

Section: Study Areamentioning

confidence: 99%

The Contribution of Saline-Alkali Land to the Terrestrial Carbon Stock Balance: The Case of an Important Agriculture and Ecological Region in Northeast China

Chang,

Ju,

Liu

et al. 2024

Land

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Saline-alkali land is an important component of terrestrial ecosystems and may serve as a carbon sink but its net contribution to the overall terrestrial carbon sink is unknown. Using methods recommended by the IPCC, this study evaluates the impacts of interconverting saline-alkali and non-saline-alkali land on terrestrial carbon stocks by measuring two major carbon pools (soil organic carbon and vegetation carbon) in the saline-alkali land of China’s Songnen Plain. Distinct phases in the evolution of the region’s terrestrial carbon stock were delineated, factors contributing to transitions between phases were identified, and the effects of changes in the saline-alkali land carbon stock on the overall terrestrial carbon sink were estimated. Between 2005 and 2020, the region’s saline-alkali land carbon stock initially increased, then declined, and finally increased again. However, the overall terrestrial carbon stock decreased by 0.5 Tg (1 Tg = 1012 g), indicating that the increase in the saline-alkali land carbon stock was due primarily to expansion of the saline-alkali land area. The conversion of non-saline-alkali land to saline-alkali land was a carbon-emitting process; consequently, in areas undergoing saline-alkali land change, the lower carbon density bound was equal to the carbon density of unconverted saline-alkali land and the upper bound was equal to the carbon density of unconverted non-saline-alkali land. In general, changes in the carbon stock of saline-alkali land correlated negatively with changes in the overall terrestrial carbon stock. The conversion of saline-alkali land into grassland and cropland through biochar improvement and the planting of saline-tolerant crops (Leymus chinensis, salt-tolerant rice) has a positive effect on promoting the enhancement of terrestrial carbon stocks.

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“…In the short term, overgrazing and the reclamation of cultivated land will reduce the biomass and species diversity of grassland plant communities and have a negative impact on the restoration of ecological communities [52]. Yu et al [28], studying the impact of cultivated land expansion on drought in the Songnen Plain, also showed that the expansion of the cultivated land area destroys vegetation communities, increases the rate of grassland degradation, and indirectly affects the regional climate [53]. This trend slowed down after the implementation of the policy of returning farmland to forest and grassland in Northeast China in 2010, and the area of sandy land also decreased.…”

Section: Dynamic Change Relationship Of the Vegetation-lake-sand Land...mentioning

confidence: 99%

“…Spatial analysis, the MEDALUS model [28], the residual trend method [29], and other means have been employed to investigate the comprehensive impacts of vegetation, sandy landscape changes, climate factors, and human activities on landscape evolution [30]. Although vegetation and sandy landscapes are more sensitive to climate factors, human activities reduce this sensitivity.…”

Section: Introductionmentioning

confidence: 99%

Vegetation–Lake–Sand Landscape of Northeast China Sandy Land between 1980 and 2022: Pattern, Evolution, and Driving Forces

Lu,

Teni,

2024

Sustainability

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Northeast China’s sandy region is an arid and semi-arid zone highly susceptible to climate change. Investigating the long-term changes in the Northeast China sandy land (Northeast China sandy land, DBSL) landscape can provide an important basis for the ecological restoration of this region. This study analyzed long-term remote sensing data of the DBSL from 1980 to 2022 and explored the spatial pattern, evolution, and driving mechanisms. In 2022, vegetation was mainly distributed in the northwest, center, and southwest, covering a total area of 30,508.82 km2. Areas with high and medium vegetation cover showed strong aggregation characteristics and were mainly distributed in the southwest, whereas those with low vegetation coverage were highly dispersed and widely distributed in the central region. Lakes were widely distributed in the northwest and central regions, with a total area of 2736.43 km2. In the last 42 years, the vegetation cover decreased by 24.48%. Areas with high and medium vegetation coverage decreased in size, and those with low vegetation coverage first increased and then decreased, with overall decreases of 35.35%, 19.16%, and 6.88%, respectively. The overall area of the DBSL showed various degrees of degradation. Shrinking and dry lakes were concentrated in the sandy hinterland. The lake landscape changed significantly from 1990 to 2010, with a decrease in lake area of 27.41%. In contrast, the sandy area increased by 25.65%, indicating a high degree of desertification. However, from 2005 to 2022, desertification decelerated. The most important factors driving the evolution of the DBSL were socio-economic factors. The increase in human disturbance will have a certain impact on the landscape changes in the region in the short term. The national policy of returning farmland to fields and grasslands will affect the increase of vegetation and lake landscape area in the short term, and the sand area and excessive animal husbandry will be reduced. This study provides a scientific basis for ecological restoration and sustainable development in Northeast China.

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Effect of farmland expansion on drought over the past century in Songnen Plain, Northeast China

Cited by 14 publications

References 31 publications

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

Soil aggregation accounts for the mineral soil organic carbon and nitrogen accrual in broadleaved forests as compared to that of coniferous forests in Northeast China: Cross‐sites and multiple species comparisons

The Contribution of Saline-Alkali Land to the Terrestrial Carbon Stock Balance: The Case of an Important Agriculture and Ecological Region in Northeast China

Vegetation–Lake–Sand Landscape of Northeast China Sandy Land between 1980 and 2022: Pattern, Evolution, and Driving Forces

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