科研之友
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摘要
The growing importance of environmental certification in plantation forestry is increasing the pressure to discontinue the use of chemicals including herbicides classified as highly hazardous. One of these herbicides is terbuthylazine, a triazine used widely to control a broad range of weeds in plantation forests in New Zealand. Using soil samples obtained from a national trial series, the key objectives of this study were to (i) determine the variation in soil adsorption of terbuthylazine as measured by distribution constant (K-d) across a range of soil types and (ii) develop a multiple regression model to predict K-d from key soil chemical properties. Across the 34 sampled sites, K-d averaged 21.9 L.kg(-1) and ranged 38-fold from 3.9 to 146.7 L.kg(-1). There was a highly significant (P < 0.0001) relationship between organic carbon and K-d, which was best described by a power function, that explained 86% of the variance in K-d. Addition of pH to the model using an exponential decay function was significant and increased the R-2 for the model to 0.99. Across soil orders, K-d varied significantly by 10-fold. Values of K-d were lowest on Raw and Recent soil orders, which have low soil organic carbon and a relatively high pH.
- 出版日期2010-7
