کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4574682 1629523 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of sample size and position from monolith and core methods on the estimation of total root biomass in a temperate grassland ecosystem in Inner Mongolia
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Effects of sample size and position from monolith and core methods on the estimation of total root biomass in a temperate grassland ecosystem in Inner Mongolia
چکیده انگلیسی

Development of an appropriate scheme to accurately sample root biomass is essential for accurate estimation of biomass and carbon budget of grassland. This study evaluated measurement accuracy of the monolith and core methods with different sample sizes and positions in a temperate grassland ecosystem in Inner Mongolia, China. The results indicated that the small core method (3.8-cm-diameter) significantly underestimated total root biomass compared with the large core method (10-cm-diameter), small monolith method (0.25 m2) and large monolith method (1 m2). Total root biomass estimated from the small core method was about 52% less than that from the large monolith method (1 m2). At 95% confidence interval, 10% relative precision could be obtained with five small monoliths, 15 large cores and 65 small cores. The coefficient of variation (CV) for total root biomass decreased logarithmically with increasing sample size for both the monolith and core methods. Compared with the stratified random sampling, core sampling with different fixed positions could not provide reliable estimate of total root biomass. Washing damage and soil lost during extraction might be the major factors controlling the measurement accuracy of total root biomass by core method with small sample size.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Geoderma - Volume 155, Issues 3–4, 15 March 2010, Pages 262–268
نویسندگان
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