土壤水分和养分对沙质草地优势植物叶片氮回收效率的影响

土壤水分和养分对沙质草地优势植物叶片氮回收效率的影响

张晶, 左小安, 吕朋

Effects of nutrient and water content on leaf nitrogen recovery efficiency of dominant plants in sandy grasslands

Jing Zhang, Xiaoan Zuo, Peng Lv

表2 降水变化、氮添加及其耦合效应对优势植物生物量的影响 (g·m^-2)

Table 2 Effects of precipitation variation， nitrogen addition and their coupling effects on dominant plant biomass

物种	生活型	处理
		CK		-60%		+60%		-60 d		+60 d
		N0	+N	N0	+N	N0	+N	N0	+N	N0	+N
狗尾草	一年生	0.46±0.22^a	26.02±12.75^a	1.97±1.14^a	0.88±0.34^b	1.96±1.01^a	1.26±0.63^b	0.89±0.32^a	0.54±0.23^b	0.73±0.56^a	5.87±2.13^b
黄蒿	一年生	11.04±5.43^a	9.30±3.85^a	13.19±5.17^a	—	20.27±12.09^a	12.63±0.10^a	15.56±6.31^a	10.54±0.40^a	26.30±7.38^a	22.55±1.11^a
白草	多年生	2.88±1.62^a	56.68±32.57^a	4.02±2.08^a	23.11±12.26^a	2.69±1.32^a	12.85±1.82^a*	6.78±3.41^a	6.32±3.44^a	2.65±1.81^a	4.69±1.11^a
糙隐子草	多年生	11.70±3.01^a	4.73±1.55^b	6.44±2.86^ab	10.12±3.28^ab	7.68±3.28^ab	15.83±6.74^ab	4.96±1.58^ab	10.29±3.76^ab	3.21±0.87^b	22.55±6.10^a**