草坪绿度光谱指数研究初报*

 选用高羊茅、多年生黑麦草、草地早熟禾、狗牙根、匍匐翦股颖5种草坪草的24个品种为试验对象，选择冠层反射光谱的绿峰反射率（Rg）和800nm处反射率（R800），构建草坪色泽指标——绿度光谱指数（GSI）。结果表明，高羊茅8个品种的绿度光谱指数在8.26～7.51范围内，多年生黑麦草8个品种在8.18～5.49范围内；草地早熟禾5个品种在7.63～6.33范围内，匍匐翦股颖2个品种在6.23～6.05范围内，狗牙根太阳城的绿度光谱指数为6.80。草坪绿度光谱指数与色泽目测评分值之间存在极显著的相关性(P＜0.01)。与传统色泽目测法相比较，利用绿度光谱指数能够更加准确而客观地对草坪色泽进行评价。

A Primary Study on Turf Green Spectral Index

Twenty four cultivars of 5 turfgrass species, which were commonly used to establish golf or sports field turf in south parts of China, were selected as test turfgrass in a suburb area of Kunming in September, 2009. Canopy reflectance and color visual rating were measured; maximum reflectance in green band and reflectance at 800 nm were selected to establish a new parameter (green spectral index, GSI) for estimating turf color. Results showed that GSI of bermuda grass (cv. Sun City) was 6.80, GSI varied from 8.26 to 7.51 for tall fescue eight cultivars, and 8.18 to 5.49, 7.63 to 6.33, 6.23 to 6.05 for perennial ryegrass eight cultivars, Kentucky bluegrass 5 cultivars and creeping bentgrass 2 cultivars, respectively. There was significant correlation relationship (P＜0.01) between GSI and visual rating value. GSI can be used to quantify and evaluate turf color more accurately and more objectively compared with traditional visual rating method.