The impacts of economic forest on global environmental change(GEC) are one of the hot issues in environmental study. Based on the 3 year observation data and 40 year climate data, GEC and analysis of the hydrologica...The impacts of economic forest on global environmental change(GEC) are one of the hot issues in environmental study. Based on the 3 year observation data and 40 year climate data, GEC and analysis of the hydrological dynamic characteristics of rubber plantations and estimate of the water balance in the rubber plantations in Hainan Island were made. The results showed that the rainfall intercepted by the canopy of the plantations accounted for 11 45% of the annual rainfall, the total runoff for 23 71%, the total evaporation and transpiration for 63 24%, the soil moisture storage for 1 6%. Analysis of the 40 year rainfall data in the 19 counties of Hainan Island during 1951—1990 showed that the large scale substitution of the natural vegetation with the rubber plantations had no significant effect on the local rainfall in Hainan Island. The main reasons are (1) 80% of the rainfall in Hainan is brought by typhoons; (2) the proportion of 11 6% rubber plantations in total forest coverage in Hainan is not enough to influence the local rainfall in Hainan Island; and (3) although the rubber plantation is artificial vegetation, it has the similar function to the tropical rain forest. Analysis of the total water resource and total GDP of Hainan in 1997 showed that the economic benefit resulted from the water resource was 1 0 RMB Yuan/m 3 The value of hydrological of the rubber plantation in Hainan was 113 9 million RMB Yuan/a when compared with the tropical rain forest. The paper reaches conclusion that the hydrological eco service function of rubber plantation has been enhanced after transformed from natural vegetation, which includes the natural service and powerful social service.展开更多
运用均匀设计结合BP神经网络算法,在磷酸、硅烷环境下将超细粉磨后的800目钢渣微粉进行优化改性后,部分代替炭黑同橡胶按比例复合制备高性能生态橡胶材料。建立制备工艺参数与力学性能的BP神经网络优化模型,优化设计生态橡胶的工艺参数...运用均匀设计结合BP神经网络算法,在磷酸、硅烷环境下将超细粉磨后的800目钢渣微粉进行优化改性后,部分代替炭黑同橡胶按比例复合制备高性能生态橡胶材料。建立制备工艺参数与力学性能的BP神经网络优化模型,优化设计生态橡胶的工艺参数。利用BET、FTIR、XRD和SEM对优化后的生态橡胶进行表征。结果表明,优化后生态橡胶制备工艺参数:磷酸与橡胶的质量比为0.013、硅烷K550与橡胶的质量比为0.003、促进剂与橡胶的质量比为0.007、硫磺与橡胶的质量比为0.011以及硬脂酸与橡胶的质量比为0.009。优化生态橡胶的力学性能:拉伸强度为18.6 MPa、邵尔A硬度为69.7和撕裂强度为45.6 k N/m。模型预测结果与实测结果具有较高的吻合度,误差范围为-1.59%^-0.85%。展开更多
文摘The impacts of economic forest on global environmental change(GEC) are one of the hot issues in environmental study. Based on the 3 year observation data and 40 year climate data, GEC and analysis of the hydrological dynamic characteristics of rubber plantations and estimate of the water balance in the rubber plantations in Hainan Island were made. The results showed that the rainfall intercepted by the canopy of the plantations accounted for 11 45% of the annual rainfall, the total runoff for 23 71%, the total evaporation and transpiration for 63 24%, the soil moisture storage for 1 6%. Analysis of the 40 year rainfall data in the 19 counties of Hainan Island during 1951—1990 showed that the large scale substitution of the natural vegetation with the rubber plantations had no significant effect on the local rainfall in Hainan Island. The main reasons are (1) 80% of the rainfall in Hainan is brought by typhoons; (2) the proportion of 11 6% rubber plantations in total forest coverage in Hainan is not enough to influence the local rainfall in Hainan Island; and (3) although the rubber plantation is artificial vegetation, it has the similar function to the tropical rain forest. Analysis of the total water resource and total GDP of Hainan in 1997 showed that the economic benefit resulted from the water resource was 1 0 RMB Yuan/m 3 The value of hydrological of the rubber plantation in Hainan was 113 9 million RMB Yuan/a when compared with the tropical rain forest. The paper reaches conclusion that the hydrological eco service function of rubber plantation has been enhanced after transformed from natural vegetation, which includes the natural service and powerful social service.
文摘运用均匀设计结合BP神经网络算法,在磷酸、硅烷环境下将超细粉磨后的800目钢渣微粉进行优化改性后,部分代替炭黑同橡胶按比例复合制备高性能生态橡胶材料。建立制备工艺参数与力学性能的BP神经网络优化模型,优化设计生态橡胶的工艺参数。利用BET、FTIR、XRD和SEM对优化后的生态橡胶进行表征。结果表明,优化后生态橡胶制备工艺参数:磷酸与橡胶的质量比为0.013、硅烷K550与橡胶的质量比为0.003、促进剂与橡胶的质量比为0.007、硫磺与橡胶的质量比为0.011以及硬脂酸与橡胶的质量比为0.009。优化生态橡胶的力学性能:拉伸强度为18.6 MPa、邵尔A硬度为69.7和撕裂强度为45.6 k N/m。模型预测结果与实测结果具有较高的吻合度,误差范围为-1.59%^-0.85%。