‘fine-roots’; (3) errors in the allometric relationships used to develop the estimates of fine-root biomass and production; and (4) several problems in the field meas- urements of fine-root biomass. Measurement errors fine-root may arise from several sources. First, there is likely to be considerable seasonal variation in fine- root biomass, so a large error will occur if the site is visited too infrequently. Second, there is generally large spatial heterogeneity in fine-root distribution, so sufficient samples are required to capture the range of spatial variation. Third, differences in sampling depth between studies will likely introduce additional inconsistencies. Finally, it may also be possible that some errors are introduced in the processes of sorting, drying, and weighing in laboratory.
Clearly, measurement errors fine-root are likely to be the most critical because they influence all other sources of error. The approach presented here, how- ever, is better equipped to reduce the first three error sources, and is not capable to address the last one. Because of the high labour cost and other efforts are required to conduct field fire-root measurements, number of fine-root measurements, particularly when specific region and species are concerned as in the cur- rent study, is generally small. This fact makes each of these reported fine-root measurements being highly valuable and so we cannot afford to select data accord- ing to measurement methods. We, however, strongly recommended the experimenters in their future field- works to take these error sources into consideration and to measure aboveground variables such as tree size distribution as well, so that their data will be more useful to large-scale studies like this one.
‘fine-roots’; (3) errors in the allometric relationships used to develop the estimates of fine-root biomass and production; and (4) several problems in the field meas- urements of fine-root biomass. Measurement errors fine-root may arise from several sources. First, there is likely to be considerable seasonal variation in fine- root biomass, so a large error will occur if the site is visited too infrequently. Second, there is generally large spatial heterogeneity in fine-root distribution, so sufficient samples are required to capture the range of spatial variation. Third, differences in sampling depth between studies will likely introduce additional inconsistencies. Finally, it may also be possible that some errors are introduced in the processes of sorting, drying, and weighing in laboratory.Clearly, measurement errors fine-root are likely to be the most critical because they influence all other sources of error. The approach presented here, how- ever, is better equipped to reduce the first three error sources, and is not capable to address the last one. Because of the high labour cost and other efforts are required to conduct field fire-root measurements, number of fine-root measurements, particularly when specific region and species are concerned as in the cur- rent study, is generally small. This fact makes each of these reported fine-root measurements being highly valuable and so we cannot afford to select data accord- ing to measurement methods. We, however, strongly recommended the experimenters in their future field- works to take these error sources into consideration and to measure aboveground variables such as tree size distribution as well, so that their data will be more useful to large-scale studies like this one.
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