In order to further optimize the cultivation and agronomic technology of Guilin Maojian tea gardens, the effects, efficiencies and costs of different farming methods and their effects on the physiochemical properties ...In order to further optimize the cultivation and agronomic technology of Guilin Maojian tea gardens, the effects, efficiencies and costs of different farming methods and their effects on the physiochemical properties of tea garden soil were studied through the modification of the test sites with the non-farming land as the control. The results showed that human farming, mini-tiller farming and crawler tractor farming could improve the physical and chemical properties of soil. After farming, the soil had good water retention but low moisture content compared to the control group, while the soil bulk density and hardness value were significantly lower than those of the control, and the porosity of soil was significantly higher than that of contrast. With the passage of time, soil bulk density and hardness value gradually increased after farming, while the porosity of soil decreased gradually. There were great differences in the effects, efficiencies and costs of different farming methods. Crawler tractor had the best and most stable farming effect, and the operation efficiency was 10 times that of human farming while the cost was only 0.39 times of human farming. Therefore, it was feasible to adopt mini-tiller or crawler tractor to carry out mechanical farming of Guilin Maojian tea garden, which provided theoretical references for the soil property improvement using mechanical farming and was favorable for promoting the popularization of farming machines and the acceleration of mechanization of tea gardens. But for tea plantations that are intended to be mechanized, apart from the mechanical and technical personnel to be configured in place, the site conditions, planting modes and mechanical way reservation of tea garden should be planned accordingly. It is recommended to select flat or gentle slope for reclamation, and preference is given to non-sexual tea tree varieties with big line spacing over 180 cm long. Moreover, the main road construction should be more than 3.0 m, and trunk road 2.0 m or above. And isolation ditch and drain should be set between the tea garden and the surrounding mountain forests and farmland.展开更多
目的:对都匀毛尖茶汤品质进行数字化评价。方法:首先应用感官审评方法对茶汤品质进行评价,然后测定茶汤中内含成分含量,利用主成分分析法和相关系数法综合筛选与茶汤品质密切相关的内含成分,最后应用偏最小二乘回归方法(partial least s...目的:对都匀毛尖茶汤品质进行数字化评价。方法:首先应用感官审评方法对茶汤品质进行评价,然后测定茶汤中内含成分含量,利用主成分分析法和相关系数法综合筛选与茶汤品质密切相关的内含成分,最后应用偏最小二乘回归方法(partial least squares regression,PLS)和人工神经网络方法(backpropagation artificial neural network,BP-ANN)尝试建立茶汤品质评价模型。结果:茶汤内含成分的前3个主成分累计方差贡献率为97.85%,筛选出7种反映茶汤品质的内含成分,分别为氨基酸、茶多酚、水浸出物、儿茶素总量、表没食子儿茶素没食子酸酯、表儿茶素没食子酸酯和表没食子儿茶素。在建立的2种都匀毛尖茶汤品质预测模型中,线性偏最小二乘方法得到的结果一般,验证集决定系数和预测均方根误差分别为0.788和1.264,而非线性人工神经网络方法建立的模型结果最佳,验证集决定系数和预测均方根误差分别为0.962和0.516,模型具有很好的稳定性。结论:应用人工神经网络方法结合主成分分析和相关分析方法实现了对都匀毛尖茶汤品质的快速、准确数字化评价,研究方法可为其他茶类茶汤品质评价提供一定程度的参考。展开更多
基金Supported by the Planned Project for Science and Technology Development of Guilin City,China(20150117-2)the Special Fund for the Basic Research Operating Expenses Program of Public Welfare Research Institute Directly Subordinate to Guangxi,China(GCJB-16-18)
文摘In order to further optimize the cultivation and agronomic technology of Guilin Maojian tea gardens, the effects, efficiencies and costs of different farming methods and their effects on the physiochemical properties of tea garden soil were studied through the modification of the test sites with the non-farming land as the control. The results showed that human farming, mini-tiller farming and crawler tractor farming could improve the physical and chemical properties of soil. After farming, the soil had good water retention but low moisture content compared to the control group, while the soil bulk density and hardness value were significantly lower than those of the control, and the porosity of soil was significantly higher than that of contrast. With the passage of time, soil bulk density and hardness value gradually increased after farming, while the porosity of soil decreased gradually. There were great differences in the effects, efficiencies and costs of different farming methods. Crawler tractor had the best and most stable farming effect, and the operation efficiency was 10 times that of human farming while the cost was only 0.39 times of human farming. Therefore, it was feasible to adopt mini-tiller or crawler tractor to carry out mechanical farming of Guilin Maojian tea garden, which provided theoretical references for the soil property improvement using mechanical farming and was favorable for promoting the popularization of farming machines and the acceleration of mechanization of tea gardens. But for tea plantations that are intended to be mechanized, apart from the mechanical and technical personnel to be configured in place, the site conditions, planting modes and mechanical way reservation of tea garden should be planned accordingly. It is recommended to select flat or gentle slope for reclamation, and preference is given to non-sexual tea tree varieties with big line spacing over 180 cm long. Moreover, the main road construction should be more than 3.0 m, and trunk road 2.0 m or above. And isolation ditch and drain should be set between the tea garden and the surrounding mountain forests and farmland.
