Three-Dimensional Optimization Development and Regulation of Land Space Based on Spatial Equilibrium Model.

The territorial space development pattern of the target construction should be able to help the full circulation and optimal allocation of social elements and resources, the society in the region is relatively fair, the development opportunities and welfare of people are equal, and the development of people, society, economy, and environment is coordinated and sustainable. This article aims to develop and control the three-dimensional optimization of the land space based on the spatial equilibrium model. This article first analyzes and introduces the spatial equilibrium model, then constructs an evaluation index model for the suitability of territorial spatial three-dimensional optimization development, and determines the index weights for the suitability of territorial spatial three-dimensional optimization development. Then, it analyzes the supply-demand relationship of the three-dimensional optimization development of the territorial space, discusses the imbalance of the supply and demand of the territorial service space, and finally summarizes the overall characteristics of the supply and demand of the three-dimensional optimization development of the territorial space based on the spatial equilibrium model. The research results show that under the conditions of rapid development, some development zones represented by the High-tech Zone in City B are seriously inadequate for industrial land use. In 2020, the proportion of industrial land in the high-tech zone of City B will exceed 17.69% of the 2015 plan. The demand for production space in the development zone is greater than the supply, which will inevitably bring certain pressure to industrial transformation.

A wireless soil moisture sensor powered by solar energy.

In a variety of agricultural activities, such as irrigation scheduling and nutrient management, soil water content is regarded as an essential parameter. Either power supply or long-distance cable is hardly available within field scale. For the necessity of monitoring soil water dynamics at field scale, this study presents a wireless soil moisture sensor based on the impedance transform of the frequency domain. The sensor system is powered by solar energy, and the data can be instantly transmitted by wireless communication. The sensor electrodes are embedded into the bottom of a supporting rod so that the sensor can measure soil water contents at different depths. An optimal design with time executing sequence is considered to reduce the energy consumption. The experimental results showed that the sensor is a promising tool for monitoring moisture in large-scale farmland using solar power and wireless communication.

[Effects of water and nitrogen regulation on the yield and water and nitrogen use efficiency of cotton in south Xinjiang, Northwest China under plastic mulched drip irrigation].

A field experiment with three irrigation amounts and five nitrogen application levels was conducted to investigate the effects of water and nitrogen regulation on the growth characteristics, yield component factors, and water and nitrogen use efficiency of cotton in south Xinjiang under mulched drip irrigation. With the increasing amount of irrigation, the plant height, leaf number on main stem, boll number, LAI, and dry matter accumulation in leaf and stem improved significantly, but the root growth was restrained. As compared with low and high irrigation amounts (4950 and 6750 mm x hm(-2), respectively), medium irrigation amount (5850 mm x hm(-2)) increased the available bolls per plant and the single boll mass averagely by 0.96 and 0.4 and by 0.22 and 0.11 g, respectively. When the nitrogen application level was 300 kg x hm(-2), as compared with other nitrogen application levels, the stem diameter increased significantly, and the growth of bud, boll, and root was accelerated. Moreover, the allocation ratio of dry matter from nutritional organs to reproductive organs under medium irrigation amount increased by 5.1% and 29.6% respectively, as compared with that under low and high irrigation amounts. Irrigation amount had significant effects on the cotton yield but little effects on the lint percentage, whereas nitrogen application level had definite effects on the cotton yield and lint percentage. However, low irrigation amount restrained the effects of nitrogen application on yield enhancement. In this experiment, when the irrigation amount was 5850 mm x hm(-2) and the nitrogen application level was 300 kg x hm(-2), the cotton grew healthily, the plant shape structure was optimized, the dry matter allocation to reproductive organs was promoted dramatically, the available bolls, single boll mass, and lint percentage increased, the cotton yield reached the highest (6992.33 kg x hm(-2)), and the water and nitrogen use efficiency amounted to 1.45 kg x m(-3) and 45.9%, respectively.