CAJ | 학술논문

基于稳定同位素技术，利用野外定位观测数据，研究了湘西北红壤丘陵区降水的同位素特征。结果表明：湘西北桃源地区2006-2007年的大气降水线为δD=7．432δ^18O＋0．605（R^2=0．953，n=36）。该地区2007年5-9月降水同位素值季节变化明显，且降雨量效应明显。油茶林外降水同位素值较林冠穿透水贫化，但两者差异很小。同位素值的高程效应在此有一定的体现，即坡上同位素小于坡下，但由于高度相差小，故表现非常不明显。雨中取样对降水同位素值影响比较大。降水同位素变化特征能很好地反映对应时段的降水特征，对今后分析土壤水分运移及确定植物水分来源研究有重要意义。
기우은정동위소기술，이용야외정위관측수거，연구료상서북홍양구릉구강수적동위소특정。결과표명：상서북도원지구2006-2007년적대기강수선위δD=7．432δ^18O＋0．605（R^2=0．953，n=36）。해지구2007년5-9월강수동위소치계절변화명현，차강우량효응명현。유다림외강수동위소치교림관천투수빈화，단량자차이흔소。동위소치적고정효응재차유일정적체현，즉파상동위소소우파하，단유우고도상차소，고표현비상불명현。우중취양대강수동위소치영향비교대。강수동위소변화특정능흔호지반영대응시단적강수특정，대금후분석토양수분운이급학정식물수분래원연구유중요의의。
Isotopic characteristics analysis conducted for precipitation samples from red soil hilly region in northwest of Hunan province, coupled with fixed-point field observation data. The results show that the Local Meteoric Water Line (LMWL) in Taoyuan area of northwest of Hunan province present δD = 7. 432δ^18O+0. 605 (R^2 =0. 953 ,n= 36), during 2006-2007. The samples isotope values , from May to September in 2007, vary greatly with season. Besides , isotope values associated significantly with rainfall amounts. The stable isotope values of precipitation outside oil-tea camellia woods present lower than that of through-fall of canopy, but with slight difference. The elevation also impacts on stable isotope value to a certain extent, with the stable isotope value of upper slope areas exceed lower slop areas. Nonetheless, isotope value difference seem to quite insignificant due to their slight elevation distance. Moreover, sampling collection during rain period also affects the results. The variation in characteristics of precipitation reflects corresponding time precipitation characteristics, it therefore has important implication for investigation into pathway for water transportation in soils and vegetations.