Uncertainty Characteristics of Climatic Potential Productivity in Guizhou Based on Normal Cloud Model

RENQingfeng, ZHANGDongping, WANGJie, WANGHongbin, HUANGFulin, XIONGXinyi, MALei

Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (17) : 131-140.

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Chin Agric Sci Bull ›› 2026, Vol. 42 ›› Issue (17) : 131-140. DOI: 10.11924/j.issn.1000-6850.casb2026-0284

Uncertainty Characteristics of Climatic Potential Productivity in Guizhou Based on Normal Cloud Model

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Abstract

To deepen the understanding of the uncertain changes in climate resources in karst areas of the Yangtze River Basin, based on meteorological data from 78 national stations in Guizhou from 1961 to 2024, this research employs a sliding time window (30a) and a backward cloud algorithm to systematically analyze the evolution of normal cloud model parameters (expectation Ex, entropy En, and hyper-entropy He) for temperature production potential (Yt), precipitation production potential (Yp), evapotranspiration production potential (Ye), and standard climatic potential productivity (Ys). The main conclusions are as follows. (1) Overall, thermal resources (Yt expectation value of 19087.25 kg/hm2) determine the upper limit of production potential in Guizhou, while water conditions are the primary limiting factor. Yp exhibits the highest randomness and fuzziness and is the main source of uncertainty for Ys. (2) Regarding temporal trends, the expectation value of Yt shows the fastest increase (138.2 kg/hm2·10a), while the expectation value of Yp shows a significant decrease (-80.3 kg/hm2·10a), leading to a slow increase in Ys (36.4 kg/hm2·10a). The entropy and hyper-entropy of Yp exhibit the strongest increasing trends, indicating intensified instability in precipitation. Abrupt changes were concentrated between 1976 and 1988, coinciding with the interdecadal climate transition. The differences before and after the abrupt changes are consistent with the long-term trends, and the trends of increasing Yt, decreasing Yp, and increasing fuzziness of Ys are projected to continue for 6 to 11 years (H>0.75). (3)Spatially, empirical orthogonal function (EOF) decomposition reveals a composite characteristic of global response (first mode variance 47.0% to 96.3%) and local differentiation (second mode reflecting topographic influences). The normal cloud model effectively characterizes the baseline, fluctuation, and fuzzy boundaries of climatic potential productivity, offering a new approach for the multi-dimensional assessment of regional agro-climatic resources.

Key words

climatic potential productivity / expectation / randomness / fuzziness / spatiotemporal variation

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REN Qingfeng , ZHANG Dongping , WANG Jie , et al . Uncertainty Characteristics of Climatic Potential Productivity in Guizhou Based on Normal Cloud Model[J]. Chinese Agricultural Science Bulletin. 2026, 42(17): 131-140 https://doi.org/10.11924/j.issn.1000-6850.casb2026-0284

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