土地整治功能分区及其整治方向研究

[目的]土地整治的目标开始由注重"新增耕地"向注重"区域功能"转变,土地整治内涵由此得到延伸。同时,也迫切需要推进以提升区域功能为导向的土地整治分区研究。[方法]文章针对我国土地整治分区管理的需求,基于我国地理环境的背景差异及地域功能的定位、土地整治内涵的演变,运用要素加权叠加法、空间聚类分析法和专家经验判断法与区划对比分析法等开展土地整治功能分区。[结果]该文构建并提出了以功能导向为核心的土地整治分区体系和方案,将我国土地整治按地域功能划分为:(1)以生态修复、保护和建设为主的生态功能保育区,(2)以基本农田建设、农地开发整理、提高区域耕地的生产能力为主的粮食安全保障功能区,(3)以城乡用地统筹整治、城市用地内部挖掘为主的经济发展支持功能区,(4)以划定保护区、保护性建设为主的景观文化维护功能区等4种类型区,进一步结合东北平原区、华北平原区、黄土高原区等12个地理空间单元,组合为61个土地整治功能一级分区。在此基础上,评价一级功能区内各县域单元土地整治功能,识别出景观文化维护功能、粮食安全保障功能、生态建设功能、生态保护功能、城镇发展优化功能和城镇发展集聚功能,续分土地整治功能二级分区即各县域的土地整治功能。[结论]基于功能导向的土地整治分区反映了区域功能及其关系对土地整治分区的引导作用,为分区管控和引导提供了科学依据,这对提升区域功能和加强土地利用功能的联系和互动起到重要的作用。     

高原湖泊乡村聚落空间分异及驱动力探测——以环洱海地区为例

以环洱海地区为例，综合运用最近邻指数、Voronoi图及基于地理网格的景观格局指数系统分析高原湖泊乡村聚落位置—规模—形态空间分异特征，并引入基于最优参数的地理探测器探测驱动因素。结果表明：(1)高原湖泊乡村聚落空间分布呈显著集聚分布特征；洱海西侧的集聚程度高于东侧，密度较大的聚落集中分布在洱海西侧、北侧及东北侧，密度较低的聚落主要分布在洱海东侧。(2)网格微观视角从位置—规模—形态刻画高原湖泊乡村聚落空间分异特征更清晰；聚落位置受洱海湖泊中心辐射作用明显；聚落规模空间分布特征呈现出“C型”结构，规模较大的聚落集中分布在洱海东侧及南北两侧区域，并呈团块状；聚落形态相对规则，结构不复杂。(3)高原湖泊乡村聚落空间分异驱动因素体现出聚落较强的“人—土—地—水”的共生关系；乡村聚落位置和形态的空间分布主要受高程、坡度等自然环境因素和距耕地、水域距离等区位可达性因素的影响，而聚落规模受GDP及人口密度社会经济因素的驱动更明显。因子之间的交互作用存在协同增强效应，其中，自然环境和区域可达性的交互作用对洱海乡村聚落位置和形态特征影响最为突出，区位可达性和社会经济的交互作用对乡村聚落规模特征协同增强...     

Modeling time-varying higher-order conditional moments: A survey

Since the introduction of the Autoregressive Conditional Heteroscedasticity (ARCH) model, the literature on modeling the time-varying second-order conditional moment has become increasingly popular in the last four decades. Its popularity is partly due to its success in capturing volatility in financial time series, which is useful for modeling and predicting risk for financial assets. A natural extension of this is to model time variation in higher-order conditional moments, such as the third and fourth moments, which are related to skewness and kurtosis (tail risk). This leads to an emerging literature on time-varying higher-order conditional moments in the last two decades. This paper outlines recent developments in modeling time-varying higher-order conditional moments in the economics and finance literature. Using the Generalized Autoregressive Conditional Heteroscedasticity (GARCH) framework as a foundation, this paper provides an overview of the two most common approaches for modeling time-varying higher-order conditional moments: autoregressive conditional density (ARCD) and autoregressive conditional moment (ARCM). The discussion covers both the theoretical and empirical aspects of the literature. This includes the identification of the associated skewness–kurtosis domain by using the solutions to the classical moment problems, the structural and statistical properties of the models used to model the higher-order conditional moments and the computational challenges in estimating these models. We also advocate the use of a maximum entropy density (MED) as an alternative method, which circumvents some of the issues prevalent in these common approaches.     

A pulse check on recent developments in time series econometrics

This article motivates and summarizes the contributions of the special issues on Recent Developments in Time Series Econometrics.     

Policy uncertainty and inventory behavior: Evidence from the US manufacturing sector

This study investigates the impact of economic policy uncertainty (EPU) on asymmetric inventory investment (i.e., inventory stickiness or sticky inventory management). Using a sample of 74,912 US firm-year observations over the 1984–2021 period, we observe a significantly negative relationship between EPU and asymmetric inventory investment. Our cross-sectional analyses reveal that managers' pessimistic expectations regarding future demand and higher cost of funding and maintaining capacity are the channels through which EPU affects asymmetric inventory behavior. Moreover, this negative impact is more pronounced for firms that face longer-duration uncertainty, rely heavily on government purchases, and have higher firm-specific political risk. Lastly, we find that reducing inventory stickiness leads to improved firm performance during periods of increasing policy uncertainty.     

Treasury return predictability and investor sentiment

We document that the Treasury market investor sentiment (TSENT) of institutional investors is a powerful predictor of bond risk premia. Specifically, TSENT positively predicts Treasury bond excess returns in and out of sample. The forecasting gains of TSENT are incremental to those in conventional bond return predictors: Fama–Bliss forward spreads, Cochrane–Piazzesi forward rate factor, and Ludvigson–Ng macro factor, as well as equity market sentiment proxies such as the investor sentiment index and the partial least squares sentiment index. Asset allocation analysis indicates the forecasting power of TSENT is economically valuable to investors. Finally, we show that the time-series bond risk premia predictability associated with TSENT relates to its predictive power for macroeconomic performance, such as payroll employment, unemployment rate, and industrial production.     

Does short sales deregulation affect qualitative information disclosure?

We examine the impact of short sales deregulation on firms' disclosure of non-financial qualitative information. Our simple analytical model predicts that, after short sales deregulation and when the cost of disclosing proprietary qualitative information to the firm and its executives is sufficiently high, shortable firms respond by disclosing less proprietary and more non-proprietary qualitative information than non-shortable firms. Using a textual analysis of qualitative information about the supply chain, available in the management disclosure and analysis sections of the annual reports of a sample of Chinese firms, and applying a staggered difference-in-differences research design, we find evidence consistent with the model's prediction.     

夫妻共同持股、公司治理与家族企业社会责任

婚姻和家庭关系可以通过家庭成员的嵌入而深刻影响家族企业的公司治理及战略决策。文章采用手工搜集的2010-2018年中国A股上市家族企业实际控制人及其配偶持股数据，检验了夫妻共同持股的治理模式对家族企业社会责任的影响。结果发现：相比丈夫单独持股企业，夫妻共同持股家族企业的社会责任表现更差，其CSR总得分与CSR评级均显著更低。机制检验表明，夫妻共同持股时，双方家族成员会更多的介入企业经营治理并担任董监高职务、企业内部控制质量更差、大股东利益侵占更加严重，低效的公司治理水平抑制了家族企业的社会责任表现。文章结论在采用工具变量法、PSM、安慰剂检验、实际控制人婚变等一系列稳健性检验后仍然成立。文章研究表明女性“她力量”未能在家族企业社会责任领域发挥决定性作用。