By using the total station , the accuracy of tree height measurement can reach 1 / 1400 ; that of volume measurement can reach 1 / 200 由于全站儀的自動(dòng)化程度很高,可與數(shù)據(jù)采集器實(shí)現(xiàn)數(shù)據(jù)的實(shí)時(shí)通訊,提高工作效率。
Birds boost tree height up to 33 percent by munching on pesky parasites that can literally suck the life out of the tall - growing plants , a new study shows 根據(jù)一項(xiàng)新研究顯示,鳥兒嚼食討厭的寄生蟲,可以促進(jìn)樹木的高度增加達(dá)33 % ,因?yàn)榧纳x會(huì)把樹木的生命力吸食殆盡。
A medium - thick shelterbelt can reduce wind velocity by more than 10 percent to a distance of 20 times the tree height on the leeward side and three times the height to the windward 中等厚度的防風(fēng)林在背風(fēng)側(cè)可在20倍于樹高的距離而在迎風(fēng)側(cè)則在3倍于樹高的距離上減小風(fēng)速10 %以上。
Total station , an electronic precise geodesic instrument , has been used in surveying forest area and tree height from 1990s in many developed countries , such as u 摘要全站儀是一種電子精密測量型工具,自20世紀(jì)90年代中期后,美、英、德、日等國在林地面積測量、樹高測量中初步使用全站儀。
Result showed that different waterlogging depths have obvious effects on tree height , diameter at breast height , under branch height , trunk morphological structure , stem base form , and growth process 結(jié)果表明:不同水分條件對(duì)池杉的樹高、胸徑、枝下高、干形、樹干基部形態(tài)及生長過程均產(chǎn)生明顯的影響。