Abstract:Using the Projection Pursuit Regression (PPR) method, the multivariate regression statistical and PPR analysis were made between the grassland yields and six other relative ecological factors observed on the desert steppe in the northern slope of Tianshan, Xinjiang in 1992~1994. The PPR regression models of herbage growth were set up, and the formations of grassland yields were analyzed and theoretically explained about them. The results showed that hay yields regularly varied according to precipitations an...
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