http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
산림토양내 질소의 양료화와 (養料化) 질산화에 관한 연구 : ion 교환수지의 처리 방법에 따른 질소의 흡수율 변화
이천용(Chun Yong Lee),David D . Myrold(David D . Myrold) 한국산림과학회 1990 한국산림과학회지 Vol.79 No.3
Soil N mineralization and nitrification can be measured conveniently using mixed bed (canon and anion) exchange resin bags. However, appropriate use of these resin bags requires pretreatment to avoid colorimetric interference and standardize N ion adsorption. Three pretreatments were evaluated : control (untreated), 2 M NaCl with a distilled water rinse, and 4 M NaCl. The 4 M NaCl treatment was effective at removing background levels of NH₄^+ and NO₃^-, but adsorbed low amounts (about 40%) of inorganic N from standard solutions. Untreated resin bags adsorbed a constant, higher amount of NO₃^- (60%), but did not remove background levels of NH₄^+. The 2 M NaCl treatment followed by a distilled water rinse performed best : it removed background NH₄^+ and adsorbed a constant amount of both NH₄^+ (70%) and NO₃^- (60%). Because the ion exchange resin is fairly expensive, we also tested if the resin bags could be reused. Resin bags were either loaded with NH₄^+ and ~i0- in the laboratory or incubated in soil in the field, desorbed with the 2 M NaCl treatment, and then loaded with standard NH₄^+ and NO₃^- solutions. Lab loaded resin bags adsorbed about 60% of inorganic N then loaded with 2.5 or 5.0 ㎎ N 1^(-1) and 70% when loaded at 10 or 20㎎ N 1^(-1), whereas reused field incubated bags showed the opposite adsorption efficiency. These results demonstrate that resin bags can give reproducible results, but care must be taken to evaluate the effect of pretreatment and potential for reuse.