地球信息科学学报
地毬信息科學學報
지구신식과학학보
GEO-INFORMATION SCIENCE
2014年
6期
915-924
,共10页
武陵山区%植被NPP%时空格局%高程%坡度
武陵山區%植被NPP%時空格跼%高程%坡度
무릉산구%식피NPP%시공격국%고정%파도
Wuling mountainous area%net primary productivity%spatio-temporal pattern%elevation%slope
本研究旨在探讨2001-2010年武陵山区植被净第一性生产力(NPP)的时空变化格局及其与主要地形因子间的关系。利用MODIS MOD17A3数据、地形数据，以及土地覆盖等数据，基于回归分析和分级统计等方法，开展了武陵山区植被NPP的时空变化格局及其与高程和坡度2个基本地形因子间关系的研究。结果表明：（1）10年间武陵山区植被年NPP的平均值为590.72 gC·m-2·yr-1，森林、灌草和农田的NPP平均值分别为596.79 gC·m-2·yr-1、586.98 gC·m-2·yr-1和563.31 gC·m-2·yr-1；（2）2001-2010年武陵山区植被NPP总量的平均值为98.90 TgC·yr-1，波动范围为92.79~106.99 TgC·yr-1，从NPP年际变化的空间分布来看，武陵山区植被NPP的变化趋势整体上呈北增南减的格局；（3）分别以30 m和3°为高程和坡度的分级级差时，发现武陵山区平均植被NPP随海拔和坡度的升高有明显的先增加后缓慢下降的趋势，但在海拔高于1500 m及坡度大于50°的地区，平均植被NPP出现了较大波动，然而，在波动中均有随海拔和坡度的增加而先上升后再下降的趋势；（4）在地理区间尺度上，200~1000 m的高程段以及5~25°的坡度段内植被NPP的平均值较高，500 m以上的高程区间平均植被NPP依次递减，但50°以上的坡度区间平均植被NPP反而有所增加，这在一定程度上反映了坡度高于某一临界值后坡面侵蚀强度又有所下降的趋势。
本研究旨在探討2001-2010年武陵山區植被淨第一性生產力(NPP)的時空變化格跼及其與主要地形因子間的關繫。利用MODIS MOD17A3數據、地形數據，以及土地覆蓋等數據，基于迴歸分析和分級統計等方法，開展瞭武陵山區植被NPP的時空變化格跼及其與高程和坡度2箇基本地形因子間關繫的研究。結果錶明：（1）10年間武陵山區植被年NPP的平均值為590.72 gC·m-2·yr-1，森林、灌草和農田的NPP平均值分彆為596.79 gC·m-2·yr-1、586.98 gC·m-2·yr-1和563.31 gC·m-2·yr-1；（2）2001-2010年武陵山區植被NPP總量的平均值為98.90 TgC·yr-1，波動範圍為92.79~106.99 TgC·yr-1，從NPP年際變化的空間分佈來看，武陵山區植被NPP的變化趨勢整體上呈北增南減的格跼；（3）分彆以30 m和3°為高程和坡度的分級級差時，髮現武陵山區平均植被NPP隨海拔和坡度的升高有明顯的先增加後緩慢下降的趨勢，但在海拔高于1500 m及坡度大于50°的地區，平均植被NPP齣現瞭較大波動，然而，在波動中均有隨海拔和坡度的增加而先上升後再下降的趨勢；（4）在地理區間呎度上，200~1000 m的高程段以及5~25°的坡度段內植被NPP的平均值較高，500 m以上的高程區間平均植被NPP依次遞減，但50°以上的坡度區間平均植被NPP反而有所增加，這在一定程度上反映瞭坡度高于某一臨界值後坡麵侵蝕彊度又有所下降的趨勢。
본연구지재탐토2001-2010년무릉산구식피정제일성생산력(NPP)적시공변화격국급기여주요지형인자간적관계。이용MODIS MOD17A3수거、지형수거，이급토지복개등수거，기우회귀분석화분급통계등방법，개전료무릉산구식피NPP적시공변화격국급기여고정화파도2개기본지형인자간관계적연구。결과표명：（1）10년간무릉산구식피년NPP적평균치위590.72 gC·m-2·yr-1，삼림、관초화농전적NPP평균치분별위596.79 gC·m-2·yr-1、586.98 gC·m-2·yr-1화563.31 gC·m-2·yr-1；（2）2001-2010년무릉산구식피NPP총량적평균치위98.90 TgC·yr-1，파동범위위92.79~106.99 TgC·yr-1，종NPP년제변화적공간분포래간，무릉산구식피NPP적변화추세정체상정북증남감적격국；（3）분별이30 m화3°위고정화파도적분급급차시，발현무릉산구평균식피NPP수해발화파도적승고유명현적선증가후완만하강적추세，단재해발고우1500 m급파도대우50°적지구，평균식피NPP출현료교대파동，연이，재파동중균유수해발화파도적증가이선상승후재하강적추세；（4）재지리구간척도상，200~1000 m적고정단이급5~25°적파도단내식피NPP적평균치교고，500 m이상적고정구간평균식피NPP의차체감，단50°이상적파도구간평균식피NPP반이유소증가，저재일정정도상반영료파도고우모일림계치후파면침식강도우유소하강적추세。
Based on MODIS NPP data, terrain data and land cover map, spatio-temporal pattern of the NPP in Wuling mountainous area during 2001-2010 and its relationship with the elevation and the slope were analyzed using regression analysis and classification statistics. Results showed that the average annual NPP of the study ar-ea from 2001 to 2010 was 590.72 gC · m-2 · yr-1. The mean NPP of forest, shrub/grassland and cropland were 596.79 gC·m-2·yr-1, 586.98 gC·m-2·yr-1 and 563.31 gC·m-2·yr-1 respectively. During 2001-2010, the average an-nual total NPP of Wuling mountainous area was 98.90 TgC · yr-1, ranging from 92.79 TgC · yr-1 to 106.99 TgC · yr-1. Besides, the spatial pattern of interannual variability of NPP in the north of our study area presented a significant increase trend, while in the south it indicated an opposite tendency. According to the relationships between the mean NPP and the elevation as well as the slope in the case of 30 m and 3° respectively, NPP increased with the altitude and slope first, then decreased slowly. But when the elevation went above 1500 m or the slope was great-er than 50°, the mean NPP would present large fluctuations. However, as a whole, the mean NPP increased with the altitude and the slope first, then decreased again. Additionally, the mean NPP within the elevation range of 200~1000 m and the slope range of 5~25° were relatively high, but it decreased gradually from the range of 500 m and above, and had a trend of increase when the slope went greater than 50°, which reflected the erosion intensi-ty was weakened when the slope was greater than a certain threshold.
