Longzhen Ni

Ms. Longzhen Ni


Research Focus & Metrics

Academic Career Length

2Years (2025-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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10 January 2026 in Land
Verified
Journal Article
Open access
PDF file
YLYu Li
Yu Li
LNLongzhen Ni
Longzhen Ni
WCwenhui chen
wenhui chen
YWYibai Wang
Yibai Wang
DXDongzhuo Xie
Dongzhuo Xie
The Yellow River Basin (YRB), a typical river system facing the challenge of balancing ecological conservation and economic development, offers valuable insights for global sustainable watershed governance through its forestry green transformation. Based on panel data from nine provinces in the basin from 2005 to 2022, this study constructs an efficiency evaluation indicator system for forestry green development. This system incorporates four inputs (labor, land, capital, and energy), two desirable outputs (economic and ecological benefits), and three undesirable outputs (wastewater, waste gas, and solid waste). By systematically integrating the undesirable outputs-based super-SBM model and the global Malmquist–Luenberger (GML) index, this study provides an assessment from both static and dynamic perspectives. The findings are as follows. (1) Forestry green development efficiency showed fluctuations over the study period, with the basin-wide average remaining below the production frontier. Spatially, it exhibits a pattern of “downstream > upstream > midstream”. (2) The average GML index is 0.984 during the study period, representing an average annual decline in forestry green total factor productivity of 1.6%. The growth dynamics transitioned from a stage dominated solely by technological progress to a dual-driver model involving both technological progress and technical efficiency. (3) The drivers of forestry green total factor productivity growth in the basin show profound regional heterogeneity. The downstream region demonstrates a synergistic dual-driver model of technical efficiency and technological progress, the midstream region is trapped in “dual stagnation” of both technical efficiency and technological progress, and the upstream region differentiates into four distinct pathways: technology-driven yet foundationally weak, efficiency-improving yet technology-lagged, endowment-advantaged yet transformation-constrained, and condition-constrained with efficiency limitations. The assessment framework and empirical findings established in this study can provide empirical evidence and policy insights for basins worldwide to resolve the ecological-development dilemma and promote forestry green transformation.

20 August 2025 in Land
Verified
Journal Article
Open access
PDF file
MTMan Teng
Man Teng
LNLongzhen Ni
Longzhen Ni
HLHua Li
Hua Li
WCWenhui Chen
Wenhui Chen
China, facing severe saline–alkali land degradation, is grappling with the paradox of technically adequate but systemically deficient land consolidation. In response to the existing evaluation system’s over-reliance on physicochemical indicators and neglect of socioeconomic value, this study proposes the use of the Optimal Land Use Value (OLV) to construct a comprehensive benefit evaluation indicator system for saline–alkali land consolidation that encompasses ecosystem resilience, supply–demand balancing, and common prosperity. Considering a case project implemented from 2019 to 2022 in the Western Songnen Plain of China—one of the world’s most severely affected soda saline–alkali regions—this study combines the land use transition matrix with a comprehensive evaluation model to systematically assess the effectiveness and sustainability of land consolidation. The results reveal systemic deficiencies: within ecological spaces, short-term desalination succeeds but pH and organic matter improvements remain inadequate, while ecosystem vulnerability increases due to climate fluctuations and grassland conversion. In production spaces, cropland expansion and saline land reduction are effective, but water resource management proves unsustainable. Living spaces show improved infrastructure and income but face threats due to economic simplification and intergenerational unsustainability. For the investigated case, recommendations include shifting from technical restoration to systemic governance via three strategies: (1) biological–engineering synergy employing green manure to enhance soil microbial activity; (2) hydrological balancing through groundwater quotas and rainwater utilization; (3) specialty industry development for rural economic diversification. This study contributes empirical evidence on the conversion of saline–alkali land, as well as an evaluation framework of wider relevance for developing countries combating land degradation and pursuing rural revitalization.

28 May 2026 in Forests
Verified
Journal Article
Open access
PDF file
LNLongzhen Ni
Longzhen Ni
XCXiaoqian Chen
Xiaoqian Chen
ZCZichan Cui
Zichan Cui
WCWenhui Chen
Wenhui Chen
Converting the diverse values of forest ecosystems into economic gains is one of the major challenges in advancing the global sustainable development agenda. As China continues to expand its factor inputs in the forestry sector, the question of whether these large-scale inputs into forest ecosystems have generated commensurate economic returns constitutes the central concern of this study. To address this question, this study proposes the concept of forest ecological product value conversion efficiency (FCE). Using provincial panel data from 30 Chinese provinces spanning 2011 to 2023, this study measures FCE and examines its spatiotemporal distribution and evolution characteristics. The findings are as follows. (1) China’s FCE exhibited a fluctuating upward trend, yet scale diseconomies have persisted, indicating that simply expanding factor inputs can no longer sustainably drive FCE gains. (2) Spatially, the economically advanced yet forest-resource-scarce eastern region exhibits the highest FCE, whereas the forest-resource-rich yet economically lagging northeastern region ranks the lowest. This pattern indicates that FCE is not primarily driven by the abundance of forest resources, but rather by the capacity to allocate and convert production factors. (3) A significant catch-up effect among FCE-lagging regions, yet this catch-up potential is contingent on the transferability of successful experiences. When FCE gains in leading regions rely heavily on location-specific resources or exclusive policy support, such experiences tend to resist diffusion, thereby constraining technology transfer and FCE convergence within the region. In summary, this study provides a FCE assessment framework for developing countries facing the dual pressures of forest resource conservation and economic development, and offers empirical evidence for shifting from an input-reliant growth model to a model that prioritizes resource efficiency in the forestry sector.

9 September 2026 in Forests
Verified
Journal Article
Open access
PDF file
XCXiaoqian Chen
Xiaoqian Chen
LNLongzhen Ni
Longzhen Ni
ZCZichan Cui
Zichan Cui
WCWenhui Chen
Wenhui Chen
YFYimin Fu
Yimin Fu
Against the backdrop of global forest degradation and timber supply constraints, improving green production efficiency in forestry while securing timber supply is an important challenge for sustainable forest management. Treating China’s National Reserve Forest Policy (NRFP) as a quasi-natural experiment, this study uses panel data for 114 prefecture-level cities from 2011 to 2022, including 67 treated and 47 control cities. We employ a staggered difference-in-differences estimator based on group-time average treatment effects, together with transmission-channel analysis, difference-in-difference-in-differences (DDD), and a spatial difference-in-differences–spatial Durbin model (Spatial DID-SDM). The baseline estimates yield an overall ATT of 0.0149, indicating an average increase of 0.0149 index points in forestry GTFP for treated cities relative to the estimated counterfactual without the NRFP. This effect is approximately 1.49% of the sample mean of forestry GTFP (0.998) and remains stable across multiple robustness and sensitivity checks. NRFP implementation is separately associated with increases in capital deepening (CD) and physical labor productivity (PLP), while the lagged values of CD and PLP are each positively associated with forestry GTFP; these results are consistent with CD and PLP as potential transmission channels. The estimated NRFP effect is significantly weaker in resource-based cities and significantly stronger in economy-efficiency-oriented regions. Spatial effect decomposition shows that both the direct and indirect effects of the NRFP are positive and statistically significant. Under the alternative spatial weight matrix, both effects retain their direction and statistical significance, while the magnitude of the indirect effect remains broadly stable, suggesting that the positive spatial spillover effect of the NRFP on forestry GTFP is reasonably robust to the spatial weight matrix specification. These findings provide city-level empirical evidence for evaluating NRFP performance and informing differentiated policy design.