Table 2. The estimated ANPP, phytolith production flux, phytolith production rate, PhytOC production flux and PhytOC production rate per year in T of CO₂.

Site	Treatment	Straw dry weight (ANPP) (kg ha−1 yr−1)1	Phytolith production flux (kg ha−1 yr−1)2	Phytolith production rate (106 tonnes yr−1)3	PhytOC production flux (kg CO2 ha−1 yr−1)4	PhytOC production rate (106 tonnes CO2 yr−1)5
LH	CK	3021 ± 82e	130 ± 6e	3.91 ± 0.18e	19.34 ± 2.58bc	0.58 ± 0.08bc
	Si300	3382 ± 55de	168 ± 12de	5.06 ± 0.37de	20.75 ± 3.19bc	0.62 ± 0.10bc
	Si600	3599 ± 86cd	201 ± 15d	6.06 ± 0.44de	17.23 ± 1.13c	0.52 ± 0.03c
	Si900	3933 ± 126cd	266 ± 27c	8.00 ± 0.81c	20.50 ± 1.94bc	0.62 ± 0.06bc
	Si1500	4531 ± 337b	347 ± 7b	10.45 ± 0.22b	27.25 ± 1.27b	0.82 ± 0.04b
	Si3000	5572 ± 103a	424 ± 27a	12.75 ± 0.79a	47.74 ± 4.70a	1.44 ± 0.14a
LST	CK	5069 ± 11f	250 ± 6d	7.53 ± 0.19d	28.36 ± 3.26c	0.85 ± 0.10c
	Si300	5329 ± 51e	292 ± 17d	8.78 ± 0.51d	39.20 ± 3.76b	1.18 ± 0.11b
	Si600	5729 ± 27d	260 ± 19d	7.81 ± 0.57d	25.29 ± 3.69c	0.76 ± 0.11c
	Si900	7016 ± 32c	393 ± 2c	11.83 ± 0.05c	30.91 ± 0.44bc	0.93 ± 0.01bc
	Si1500	7540 ± 145b	509 ± 36b	15.31 ± 1.08b	40.46 ± 2.27b	1.22 ± 0.07b
	Si3000	8256 ± 63a	677 ± 31a	20.39 ± 0.92a	85.00 ± 3.13a	2.56 ± 0.09a
XY	CK	5597 ± 145e	363 ± 36c	10.94 ± 1.09c	52.80 ± 9.01b	1.59 ± 0.27b
	Si300	6095 ± 89d	382 ± 9c	11.50 ± 0.26c	64.38 ± 4.25b	1.94 ± 0.13b
	Si600	6370 ± 98c	382 ± 2c	11.50 ± 0.07c	63.36 ± 2.16b	1.91 ± 0.06b
	Si900	7208 ± 65b	454 ± 17b	13.66 ± 0.50b	63.01 ± 6.22b	1.90 ± 0.19b
	Si1500	7405 ± 12ab	464 ± 20b	13.97 ± 0.59b	69.34 ± 4.41ab	2.09 ± 0.13ab
	Si3000	7592 ± 28a	592 ± 25a	17.83 ± 0.76a	86.28 ± 5.90a	2.60 ± 0.18a
DZ	CK	2335 ± 184e	149 ± 3c	4.49 ± 0.10c	16.24 ± 0.29d	0.49 ± 0.01d
	Si300	2928 ± 68d	212 ± 11b	6.39 ± 0.33b	30.82 ± 1.85b	0.93 ± 0.06b
	Si600	3356 ± 320d	249 ± 5b	7.51 ± 0.14b	31.20 ± 1.72b	0.94 ± 0.05b
	Si900	3501 ± 307c	257 ± 21b	7.75 ± 0.62b	24.22 ± 2.32c	0.73 ± 0.07c
	Si1500	3694 ± 95b	261 ± 11b	7.86 ± 0.34b	20.27 ± 1.42 cd	0.61 ± 0.04 cd
	Si3000	4307 ± 44a	341 ± 32a	10.27 ± 0.97a	37.58 ± 1.50d	1.13 ± 0.05a
QH	CK	3708 ± 92e	239 ± 22c	7.20 ± 0.66c	39.13 ± 3.99c	1.18 ± 0.12c
	Si300	3972 ± 166d	339 ± 26c	10.22 ± 0.78c	55.28 ± 2.30bc	1.66 ± 0.07bc
	Si600	4772 ± 37c	346 ± 22c	10.42 ± 0.66c	55.66 ± 5.05bc	1.68 ± 0.15bc
	Si900	5686 ± 72bc	488 ± 62b	14.68 ± 1.87b	78.44 ± 8.03ab	2.36 ± 0.54ab
	Si1500	5358 ± 33b	542 ± 26ab	16.32 ± 0.78b	86.88 ± 3.76a	2.62 ± 0.11a
	Si3000	6248 ± 93a	648 ± 35a	19.52 ± 1.06a	104.24 ± 1.83a	3.14 ± 0.06a

¹ANPP is above-ground net primary productivity.

²Phytolith production flux was estimated using Equation 2.

³Phytolith production rate was estimated using Equation 3.

⁴PhytOC production flux was estimated using Equation 4.

⁵PhytOC production rate was estimated using Equation 5.