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Seasonal variation of vegetation productivity over an alpine meadow in the Qinghai–Tibet Plateau in China: modeling the interactions of vegetation productivity, phenology, and the soil freeze–thaw process
Alpine meado Qinghai– Tibet Platea Unfro zen water Prima ry production
2013/9/2
Phenolog y cont rols the seaso nal activ ities ofvege tation on land surfaces and thu s plays a fun damenta lrole in regu lating pho tosynthesi s and othe r ecosyste mprocesses. There fore, accuratel ...
草地振动式间隔松土机设计与试验(Design and Experiment on Vibration Spacing Scarifier for Meadow)
松土机 振动 草原改良 虚实耕作 设计 试验
2010/2/26
针对我国草原长期过载放牧,造成土壤板结严重,导致草原退化的问题,设计了9ST-460型草地振动式间隔松土机。该机采用间隔配置的梯形框架式松土部件,利用曲轴连杆机构产生的向上激振力,对通过松土部件的土壤进行强制振动疏松,实现了在不破坏草原植被的条件下,对高坚实度草原土壤的松土作业。田间试验表明:机具在前进速度1m/s、振动频率10.0Hz情况下,作业稳定,松土效果明显。经检测,松土平均深度20.01...